Pacific War

Japan began to expand in the late 19th century, annexing Okinawa in 1879, then defeating China in a short decisive war in 1894/95, annexing Taiwan and the Liaodong Peninsula, and forcing China to give up its influence over its vassal state Korea. In the same period, the US became more active in the Pacific, taking over the Philippines in 1898 after a war with Spain, and annexing Hawaii and Guam. Various European powers also expanded their holdings or influence in the region.
Japan won a war against the Russian Empire in 1905, the first time in centuries that a non-European power defeated a European one. Once the Russians were out of their way, they annexed Korea outright in 1910. Japan would join the Allies during World War I, and would thus gain more territory from the defeated Central Powers, including the former German concessions in China, following the end of that war in 1918. Japan then staged the Mukden Incident and used it as a pretext to occupy Manchuria in 1931, and invaded central China in 1937. There was a faction fight among the Japanese high command in the late 30s; should they "Strike North", expand into Mongolia and Siberia and fight only the Russians, or "Strike South" which would mean fighting the US and the British Empire. Striking north was tried, but in 1939 the Soviets gave Japanese forces a thorough thrashing at the Battle of Kalkhin Gol in Mongolia; after that, they concentrated on striking south.
During the course of the war, the Japanese managed to occupy much of coastal China, including the then-capital Nanjing. However, the resistance they encountered, particularly in inland areas, was much fiercer than expected, and they never managed to occupy the entire country. The conflict in China went on until the war ended in 1945, killed at least 10 million, and kept about half the Japanese army tied down in China while other Allies fought the other half. Western powers backed China, sending supplies via the Burma Road and imposing sanctions on Japan.
Meanwhile, World War II in Europe began with the German invasion of Poland in September 1939, and became more complex when Germany invaded the Soviet Union in June 1941.
The conflict became global in December 1941, when Japan attacked Pearl Harbor, other US bases in the Pacific, the Philippines, and British possessions such as Hong Kong, Burma and Malaya. The United States and the entire British Empire immediately declared war on Japan, and Germany declared war on the US. The Soviet Union did not declare war on Japan until after the end of the war in Europe. American and British sanctions had been imposed on Japan after the invasion of China in 1937; those, in particular restrictions on oil imports, were the main reason Japan gave for going to war with those nations.
After that, Japan proceeded to invade and occupy much of Southeast Asia and parts of Oceania; they even managed to bomb the city of Darwin in Australia. By the middle of 1943, virtually all of Southeast Asia had been conquered by Japan, with the colonial powers of the United Kingdom, France, the Netherlands, Portugal and the United States all having suffered humiliating defeats at the hands of the Japanese.
The Japanese took effective control of some areas without fighting. The Vichy government in France, essentially a German puppet regime, ordered French administrators in French Indochina (now Vietnam, Laos and Cambodia) to co-operate with Japan, and most did. Thailand, the only country in Southeast Asia not colonized by Western powers, remained nominally independent but was forced to dance to the Japanese tune. Japan was able to establish military bases in these countries and to freely move troops and supplies through them.
Japanese propaganda claimed they were driving out Western imperialists, leading an "Asia for Asians" movement, and this got them some support; countries such as India had both pro-Japanese and pro-Allied movements. In many areas, this was also divided along ethnic lines; in Malaya, at least initially, the Japanese were welcomed by the ethnic Malays and Indians, but opposed by the ethnic Chinese. Subhas Chandra Bose, the leader of the pro-Japanese Indian National Army (INA), is still widely regarded as a national hero in India. In China both the Kuomintang and the Communists opposed Japan, but they were sometimes more interested in fighting each other. Everywhere, the local political movements were jockeying for control and trying to use the war to gain independence and/or domestic political influence for the time after the war.
In general though, Japanese rule in the occupied territories was brutal, and by the end of the war, the Japanese had lost the support of much of the local population who initially supported them (e.g. Burmese independence hero Aung San). In the occupied areas, Japanese troops engaged in mass rapes, massacres and pillaging, with Nanking Massacre of 1937-38 being the most notorious. Many women from China, Korea and other occupied areas were forced to serve as "comfort women", sex slaves in Japanese military brothels. As retribution for their role in resisting Japanese rule in China, the ethnic Chinese — both in China and in Southeast Asia — were singled out for the harshest treatment; in all the occupied territories, they were rounded up for "screening" by the Japanese, and the unfortunate ones who were identified (often arbitrarily) as anti-Japanese were brought to remote locations and shot. The Japanese also performed inhumane experiments on captive locals from the occupied territories, the most famous being Unit 731 in Manchuria (listed below), though other similar units existed throughout the occupied territories.
The Japanese suffered their first major defeat at the Battle of Midway in June 1942, when the Americans successfully intercepted and decoded Japanese communication, and surprised the Japanese by destroying their aircraft carriers when the planes were away on a bombing raid. The Americans were also able to take the island of Guadalcanal by February 1943, allowing them to defend American supply and communication lines to Australia and New Zealand. This marked the turning point in the Pacific War, and by 1945, the Americans were able to re-take the Philippines, while the British were able to re-take Burma with the help of the Chinese, and reopen the Burma Road to supply Chinese forces. The Japanese had also spread their forces too thinly in China, and the Chinese, with the support of the British and Americans, were able to counterattack and reclaim some of the occupied territories. The Americans prepared to invade Japan itself, culminating in the battles of Okinawa and Iwo Jima, in which the Americans managed to score decisive victories and occupy the islands, from which they were able to attack the Japanese mainland. Subsequently, the Americans dropped the first (and to date only) atomic bombs to be used in actual combat on Hiroshima on 6 August 1945, followed by Nagasaki on 9 August 1945. Japan surrendered unconditionally to the Allies on 15 August 1945, bringing World War II to an end.

Aftermath

Following the surrender, Japan was forced to give up all its colonies. While the Emperor remained on his throne, many political and military leaders were indicted in the International Military Tribunal for the Far East, and many were sentenced to death. Taiwan and Manchuria were returned to China, though the Chinese Civil War would resume following the Japanese surrender, eventually resulting in victory for the communists in the mainland, and the nationalists being forced to retreat to Taiwan, which continues to be governed separately to this day. Korea regained its independence, but would be split into the communist North Korea and the capitalist South Korea, leading up to the Korean War. Okinawa would be occupied by the Americans, and was only returned to Japan in 1972, though the United States continues to maintain a strong military presence there.
The Western colonial powers also got their colonies back, but the war had galvanised many nationalist movements, which were to come of age in the years to come and eventually lead to the independence of the colonies. The first was the Philippines, where American rule ended in 1946; the largest was the end of the British Raj in 1947, which became the modern countries of India and Pakistan. The Indochina Wars were a brutal example of lingering national and ideological conflict in Asia. Hong Kong and Macau would eventually be given back to China in the 1990s but part of the agreement between China and the former colonial powers stipulates a "one country two systems" arrangement that makes both act like independent countries in some regards.

Many places that were sites of battles, atrocities or other wartime activities can be visited.

Australia

• Darwin Military MuseumDarwin was an important staging point for Australian and American forces during the war, and would be the only Australian city that was subject to Japanese bombing raids. The museum houses exhibits about the bombing of Darwin.

• Australian War MemorialLocated in Canberra, the memorial also consists of a military museum dedicated to the memory of Australian soldiers who fought in various wars including both world wars.

China

See Chinese Revolutions for background.

• Nanjing Massacre MemorialCommemorates the late 1937 slaughter of a huge number of civilians in and around Nanjing by the invading Japanese army.

• Unit 731 MuseumA museum in Harbin located in a former bio-chemical weapons testing facility built by the Japanese and used to perform experiments on Chinese citizens and POWs. After the war, the Americans agreed to cover up their actions and grant immunity from prosecution to the scientists involved in exchange for being granted exclusive access to the data, as they feared that the data would end up in the hands of the Soviet Union, and many of those scientists ended up having successful careers in academia.

• ChangshaThe site of four separate battles between the Chinese and Japanese in 1939, 1941, 1942 and 1944. The first of those was the first significant victory scored by the Chinese over the Japanese during World War II. The Japanese were only able to capture Changsha on their fourth attempt in 1944. One of the battlefields has been preserved at the Yingzhushan War of Resistance Site Park (影珠山抗战遗址公园) about 70km northeast of downtown Changsha. One can also visit war memorials, graves and former military buildings at the Yuelu Mountain National Scenic Area (岳麓山国家重点风景名胜区) in the western part of the city.

• ChongqingThe "temporary capital" of China during World War II, after Nanjing had fallen to the Japanese. Despite numerous attempts by the Japanese to take it, Chinese resistance in the inland areas was much fiercer than the Japanese expected, and though it was heavily bombed, Chongqing managed to avoid Japanese occupation for the duration of the war.

Mongolia

• Khalkhin GolSite of a battle in 1939 in which the Soviets demolished a large Japanese force. This turned Japanese thinking away from expansion into Mongolia and Siberia; instead they adopted a "strike south" strategy which led directly to Pearl Harbor and their attacks in Southeast Asia.

Southeast Asia

• Burma RoadThis road ran from Western China into Burma (now Myanmar) and connected to Assam in Eastern India as well. It was built by the Chinese in the late 1930s, upgraded by the Americans later, and used throughout the war.

• Reflections at Bukit Chandu

  address: 31K Pepys Road, Singapore 118458
  An interpretive centre of the Battle of Pasir Panjang, one of the fiercest battles in the Malayan Campaign that pitted the Malay Regiment (today the Royal Malay Regiment, the most decorated regiment in the Malaysian Army) against the Japanese.

• Ford Motor Factory

  address: 351 Upper Bukit Timah Road, Singapore 588192
  A former factory of American automobile manufacturer Ford, and the first motor vehicle factory to be opened in Southeast Asia. This is also the site where the British lieutenant-general Arthur E. Percival surrendered unconditionally to Japanese general Tomoyuki Yamashita on 15 February 1942, thus ending the Malayan Campaign. It was also used by the Japanese to produce military vehicles during the occupation. It has now been converted to a museum dedicated to life in Singapore during the Japanese occupation. The boardroom in which the surrender took place has also been reconstructed for viewing.

• The Battlebox

  address: 2 Cox Terrace, Singapore 179622
  A former British military bunker and command centre which served as the headquarters for the British forces in Malaya during the Malayan Campaign. This was where Lieutenant-General Arthur E. Percival met with his senior officers and made the decision to surrender to the Japanese. It has been converted to a museum dedicated to the Malayan Campaign, and a re-enactment of how it functioned during the war.

• Changi MuseumA former POW camp-turned-museum has information about the Japanese occupation of Singapore and what life was like in the POW camp. It focuses on the general history and conditions as well as containing personal accounts and artifacts donated by former prisoners.

• Sandakan Memorial ParkThis memorial in the Malaysian city of Sandakan was built at the site of a former Japanese POW prison camp with funding from the Australian government to commemorate the Allied POWs who lost their lives during the Sandakan Death Marches. Only 6 people out of several thousand survived the march, and only because those 6 managed to escape. Incidentally, all 6 survivors were Australian.

United States

• Pearl HarborSite of the bombing in Western Honolulu that caused the United States to enter the war.

• The National WWII Museum

  phone: +1 504 528 1944
  address: New Orleans
  Museum commemorating the American war effort in both theatres of World War II, with interactive displays that aim to re-create the battlefield experience for visitors.

A number of sites in the US commemorate the internment of Japanese-Americans during the war.

• Manzanar Internment CampThe largest internment camp in the United States where approximately 110,000 Japanese-Americans and Japanese nationals living in the United States during the war were forced to live after being ordered to leave their homes. This museum contains information about the camp, the experiences of those who were forced to live here, and life after the war.

• WWII Japanese American Internment MuseumA former internment camp turned into a museum to educate people about the lives of Japanese-Americans at the Rohwer Relocation Center.

• Topaz MuseumThe Topaz Relocation Center (internment camp) housed over 11,000 Japanese-Americans. Because people were moved here before it was finished, internees were actually hired to build the wire fences to pen themselves in.

• Tule Lake Segregation Center

• MacArthur Memorial

  phone: +1-757-441-2965
  address: 198 Bank St; Norfolk, VA 23510
  Museum dedicated to the life of Douglas MacArthur, the general who led U.S. forces to victory over the Japanese in the Philippines, and was appointed Supreme Commander of the Allied Forces. His grave is located within the museum. The last non-president to have been granted a U.S. state funeral.

• Port Chicago Naval Magazine National Memorial

  phone: +1 925 228-8860 ext 6520 (reservations)
  This memorial honors 320 individuals (including 200 young African American men) who were killed in a munitions accident during World War II while loading munitions and bombs onto ships bound for the Pacific Rim. Following the explosion many of the enlisted men refused to work, resulting in the Navy's largest mutiny trial and eventually helping to push the US Armed Forces to desegregate. The memorial is located on an active military base and as a result reservations must be made at least two weeks in advance and all visitors must be US citizens or permanent residents. Reservations can be made by calling or via an online reservation form. All visitors are shuttled to the memorial from John Muir National Historic Site in nearby Martinez.

• Aleutian World War II National Historic Area

  phone: +1 907 581-1276
  This site is the remains of one of four WWII era forts constructed to defend Dutch Harbor against a potential Japanese attack. The visitor center is free, however, a Land Use Permit must be obtained to visit the historic site on Mount Ballyhoo.

South Sea

• Wake IslandThis US-controlled island was taken by Japan shortly after Pearl Harbor and held by them throughout the war. There are ruins of Japanese fortifications, a monument for the American defenders who put up a stiff fight despite being badly outnumbered and outgunned, and a monument for a group of 98 POWs executed by the Japanese. Today the island is a US military base, off limits for most visitors.

• Henderson AirfieldThe Japanese began constructing an airfield in May 1942 in Honiara. Knowing that if they completed it, they'd be able to both isolate Australia from its allies and launch potentially devastating attacks, America quickly moved to take control of the airfield. It took six months to secure the airfield, after which the Americans finished construction on it and used it to launch attacks on other islands.
  
  Henderson Airfield was later expanded to become the international airport of the Solomon Islands, so of course it can be visited. Other sites around the airport include Bloody Ridge (where America defended against the Japanese), the Gifu (named after the city by the same name, it was a Japanese post attacked by the US), Mount Austin (used by the Japanese to get a full view of the airfield in their plan to retake it), as well as memorials for both the Americans and Japanese that fought here.

• Betio IslandWithin a few days of Pearl Harbor, the Japanese took the Gilbert Islands, then a British colony, now part of the independent nation Kiribati. America's first attack on Japanese forces occurred in Butaritari, in the Gilberts, shortly after that.
  
  In late 1943, the Americans came to oust Japan from the islands, which by then had been heavily fortified. Betio Island in Tarawa was the site of the Battle of Tarawa, considered to be one of the bloodiest battles of the war. While war relics can be found on multiple islands throughout Kiribati, Betio Island is where the main battle took place and also where the most remains. Visitors can see tanks, bunkers, shipwrecks, guns, and memorials built by the Japanese, Americans, and Australians and New Zealanders.

• Kokoda TrackAn important battle line in Papua New Guinea, between Australia and Japan, it is now a trekking destination, especially for Australians.

• DarwinThe only Australian city to have been attacked by a Japanese air raid has a memorial monument on its wharf, and a veterans' cemetery nearby.

• Command RidgeDuring World War II, Nauru was occupied by the Japanese military from August 1942 until their surrender at the tail end of the war in the wake of three years of near-continuous Allied air raids. Today, rusting relics from this era are scattered thoroughout the island — disused Japanese pillboxes line the shore every couple of kilometres, and old cannons can be seen along roadsides barely hidden by forest or even in plain sight between homes. However, for those who want a firsthand look at Nauru's WWII history, Command Ridge (Nauruan: Janor) is the place to go. As the island's highest point, rising to an elevation of 63 m above sea level, it was a natural lookout point for the occupiers — and today you'll find there a bevy of old artillery emplacements (including a pair of six-barrel antiaircraft guns still pointed skyward), the ruins of a prison complex used to hold interned Nauruan natives (who were treated brutally by the Japanese) as well as five members of the Australian military captured during the invasion, and — most impressive of all — the former communications center, now open for any visitors to enter. The interior is not well lit, but bring in a lantern or torch and you'll still be able to make out faded Japanese writing on the walls.

• War in the Pacific National Historical ParkOn Guam, but part of the US national park system since Guam is an American territory. The park honors all those who fought in the Pacific, not just on Guam and not just Americans. Guam was taken by the Japanese early in the war and retaken by the US in 1944.

Philippines

• MacArthur Landing Memorial National ParkThis is where General McArthur landed on his return to the country in 1944; it is in Palo municipality on Leyte Island, near Tacloban.

• CoronThis town in Palawan Province has excellent wreck diving; the US Navy sank about a dozen Japanese ships in shallow water nearby in 1944.

Japan

• Okinawa Peace Park and Himeyuri MonumentConsidered to be the site of one of the most brutal and bloody battles of the war, Okinawa island has many war remnants and memorials. Outside of Japan, Okinawa is often viewed as the first battle on Japanese soil however, like the other Pacific Islands, Okinawa was also colonized territory so the local population was not fully trusted by the Japanese and often treated as expendable. With the Americans being obvious enemies and the Japanese not being complete allies, the question on many Okinawans' minds was not "How am I going to survive?" but "How do I want to die?". The museums here show the war from a uniquely Okinawan perspective, including life for citizens, students and military. It also depicts well how they were mistreated by both the Japanese and the Americans during and after the war. The Peace Park and the Himeyuri Monument in Itoman are the best places to learn about the battle, but remnants and reminders of the war can be found throughout the island.

• Iwo JimaAnother group of islands close to Japan, scene of some extremely fierce fighting. An image of victorious US Marines raising the Stars and Stripes there is quite famous. US Military Tours has exclusive rights to the island and only US citizens who are members of the Iwo Jima Association of America, WWII veterans, or WWII prisoners of war are eligible to join the tours.

• Chiran Peace Museum for Kamikaze PilotsAs the war approached the home islands, the desperate Japanese began sending out young men to fly aircraft packed with explosives into American ships. The museum is located in Minamikyushu over the former spot where the tokko pilots (known abroad as kamikaze pilots) were trained and flew from. The museum contains information about the pilots, artifacts and letters from them, and recovered kamikaze planes.

• Hiroshima Peace Park and Memorial MuseumHiroshima was the first place in the world to be attacked with an atomic bomb. The museum shows how devastating the bomb was to the city and the effects it had on the people from the immediate aftermath to the present day.

• Nagasaki Atomic Bomb Museum and Peace Memorial HallMuseums that are on the site where the atomic bomb was dropped on August 9, 1945. The Nagasaki bombing led to Japanese surrender and is also noted as the last place to have an atomic bomb dropped on it.

Memorials

There are also many other sites that commemorate parts of the war.

• The at Arlington, Virginia, depicts the famous scene of the raising of the (American) flag on Iwo Jima, whose history is told by the movie Flags of our Fathers directed by Clint Eastwood. One of the soldiers involved, Ira Hayes, is commemorated in a fine song by Johnny Cash.

• US National Museum of the Pacific WarIn Fredericksburg (Texas), home town of Admiral Chester Nimitz who commanded US forces in part of the Pacific, this is a large museum complex with many exhibits.

• Bank KerapuThere is a small war memorial and museum in the former Bank Kerapu building in Kota Bharu, Malaysia, which served as a secret police station during the Japanese occupation; it might not merit a special trip but is worth visiting if you are in Kota Bharu

• There are Commonwealth War Cemeteries in Taukkyan, Thanbyuzayat, Kranji, Taiping, Labuan, Sai Wan, Kanchanaburi, Imphal, Chennai and Yokohama as well as an American War Cemetery in Manila, in which many of the Allied war dead are buried.

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