Why Did America Enter Ww2

So, why did america get involved in world war II? Well, America did not enter the war until december 7th, 1941 when Japanese fighters attacked the U.S. fleet stationed at pearl harbor. But what happened before the war (1933-1939) That made us enter it? When the war started in europe in 1939 the American people were very hesitant to join in on another war. But, Roosevelt insisted that they build up the armed forces. congress even passed a law saying that it was okay to send munitions to France and to the UK. Even though Franklin Roosevelt did everything in his power to stop becoming involved in it, Japan invaded manchuria. Roosevelt’s reaction to this was shutting off trade with japan, which meant no oil for Japan because Japan didn’t have the capacity to produce oil for itself, and in turn it made the japanese even more mad than before, and it made the Japanese think of the USA as the biggest threat to their cause/expansion, and since the U.S. had a pretty powerful navy, and the Japanese could not reach the mainland U.S., Their only option was to attack the fleet at

And since there was american bases in the philippines at the time, and they could cut off communication between the home islands and the islands taken over, the Japanese had to take them out as well. This was the basis for their war plans. In the European Theatre, the extremely fast fall of France and the likely collapse of Britain meant that the american defense effort had to get faster. Even though we were not directly involved in the war yet, the American and British held conferences to discuss what would happen in the event of the U.S. becoming involved in the war directly. Companies that did not even make weapons started to make weapons for the government with government contracts. Even the computer company IBM (although not known very well at the time) made weapons for the military. This buildup started our war