December 7, 1941
US enters WW2
Japanese airplanes made a surprise attack on the US naval base at Pearl Harbor in Hawaii. More than 2,400 people were killed, and many US battleships and airplanes were destroyed.
The next day, President Roosevelt asked Congress to declare war on Japan. They agreed and the US officially entered WWII on December 8, 1941. On December 11, Germany and Italy declared war on the US
US forces attacked island after island held by the Japanese. This campaign brought American troops closer and closer to Japan.
The Allies thought about invading Japan, but were worried that too many soldiers would die. President Harry Truman made a difficult decision to use nuclear weapons against Japan. He warned the Japanese government to surrender, but they refused to give up.