24.5: The United States and the Japanese War

As Americans celebrated V-E (Victory in Europe) Day, they redirected their full attention to the still-raging Pacific War. As in Europe, the war in the Pacific started slowly. After Pearl Harbor, the American-controlled Philippine archipelago fell to Japan. After running out of ammunition and supplies, the garrison of American and Filipino soldiers surrendered. The prisoners were marched eighty miles to their prisoner-of-war camp without food, water, or rest. Ten thousand died on the Bataan Death March.¹¹

But as Americans mobilized their armed forces, the tide turned. In the summer of 1942, American naval victories at the Battle of the Coral Sea and the aircraft carrier duel at the Battle of Midway crippled Japan’s Pacific naval operations. To dislodge Japan’s hold over the Pacific, the U.S. military began island hopping: attacking island after island, bypassing the strongest but seizing those capable of holding airfields to continue pushing Japan out of the region. Combat was vicious. At Guadalcanal American soldiers saw Japanese soldiers launch suicidal charges rather than surrender. Many Japanese soldiers refused to be taken prisoner or to take prisoners themselves. Such tactics, coupled with American racial prejudice, turned the Pacific Theater into a more brutal and barbarous conflict than the European Theater.¹²

Japanese defenders fought tenaciously. Few battles were as one-sided as the Battle of the Philippine Sea, or what the Americans called the Japanese counterattack, the Great Marianas Turkey Shoot. Japanese soldiers bled the Americans in their advance across the Pacific. At Iwo Jima, an eight-square-mile island of volcanic rock, seventeen thousand Japanese soldiers held the island against seventy thousand Marines for over a month. At the cost of nearly their entire force, they inflicted almost thirty thousand casualties before the island was lost.

By February 1945, American bombers were in range of the mainland. Bombers hit Japan’s industrial facilities but suffered high casualties. To spare bomber crews from dangerous daylight raids, and to achieve maximum effect against Japan’s wooden cities, many American bombers dropped incendiary weapons that created massive firestorms and wreaked havoc on Japanese cities. Over sixty Japanese cities were fire-bombed. American fire bombs killed one hundred thousand civilians in Tokyo in March 1945.

In June 1945, after eighty days of fighting and tens of thousands of casualties, the Americans captured the island of Okinawa. The mainland of Japan was open before them. It was a viable base from which to launch a full invasion of the Japanese homeland and end the war.

Estimates varied, but given the tenacity of Japanese soldiers fighting on islands far from their home, some officials estimated that an invasion of the Japanese mainland could cost half a million American casualties and perhaps millions of Japanese civilians. Historians debate the many motivations that ultimately drove the Americans to use atomic weapons against Japan, and many American officials criticized the decision, but these would be the numbers later cited by government leaders and military officials to justify their use.¹³

Early in the war, fearing that the Germans might develop an atomic bomb, the U.S. government launched the Manhattan Project, a hugely expensive, ambitious program to harness atomic energy and create a single weapon capable of leveling entire cities. The Americans successfully exploded the world’s first nuclear device, Trinity, in New Mexico in July 1945. (Physicist J. Robert Oppenheimer, the director of the Los Alamos Laboratory, where the bomb was designed, later recalled that the event reminded him of Hindu scripture: “Now I am become death, the destroyer of worlds.”) Two more bombs—Fat Man and Little Boy—were built and detonated over two Japanese cities in August. Hiroshima was hit on August 6. Over one hundred thousand civilians were killed. Nagasaki followed on August 9. Perhaps eighty thousand civilians were killed.

Emperor Hirohito announced the surrender of Japan on August 15. On September 2, aboard the battleship USS Missouri, delegates from the Japanese government formally signed their surrender. World War II was finally over.