December 7, 1941
In a surprise wave of attacks on the U.S. naval base, Pearl Harbor, at Oahu Island, Japan takes out America's Pacific fleet (the fleet's three aircraft carriers are not present during the attack). With approximately 2,400 U.S. troops killed and another 1,000 wounded, President Franklin D. Roosevelt calls it "a date which will live in infamy." The next day, the U.S. officially enters World War II, declaring war on Japan.
Battle of the Philippine Sea
June 19-20,1944
Japan attacks Allied forces who have advanced in the Pacific Theater to the Marianas Islands in the war's largest aircraft carrier battle. Prepared for the strike, the United States launches a stunning counter-attack, and the battle is later called the "Marianas Turkey Shoot" due to minimal U.S. casualties and the Japanese losing some 600 aircraft, two oilers, and three carriers.
April 1 to June 22, 1945
World War II's final major battle—and one of the bloodiest—begins on Easter Sunday as the U.S. Army and Marine forces invade Okinawa in the Ryukyus island chain southwest of Japan, with orders to take the island to execute air strikes against Japan and create a blockade.
Counter-striking with kamikaze attacks, the Japanese sink 26 Allied ships and damage nearly 170 more, causing more than 12,000 American deaths over the course of the three-month battle. Finally overpowered by the Americans, many surviving Japanese kill themselves rather than surrendering. In the end, more than 100,000 Japanese are killed, along with 150,000 civilians.