Final answer:
The United States committed seventy percent of its resources to the war in Europe when it entered World War II because President Roosevelt viewed Germany as the greater threat to freedom and democracy. Japan was seen as a secondary threat, and the United States wanted to prioritize defeating Germany first.
Step-by-step explanation:
When the United States entered World War II, President Roosevelt believed that Germany posed a greater threat to freedom and democracy. This led to a strategic decision to commit seventy percent of the country's resources to the war in Europe. Roosevelt viewed defeating Germany as a priority and saw Japan as a secondary threat. The United States wanted to focus on the greater threat first, which is why the majority of resources were allocated to the war in Europe.