Question

When it first entered World War II, why did the United States commit most of its resources to the war in Europe? Stalin assured Roosevelt that the Soviet Union could deal with Japan. Roosevelt felt the other thirty percent was needed to defend the US mainland. Roosevelt did not feel the United States needed to engage Japan. Roosevelt felt that Germany was more of a threat than Japan.

Answer 1

They did so because they wanted to be allies with Europeans. You would be at a bigger advantage with more countries on your side.