The United States entered World War ll because

The US entered the war after the bombing of Pearl Harbor by the Japanese on December 7, 1941

Explanation:

answer; professor;

roosevelt essentially took the opposite approach as hoover in taking on the great depression. herbert hoover thought that america and its economy could naturally recover from the depression in due course, so he adamantly restrained the federal government from intervening on behalf of the people affected. on the other hand, roosevelt dramatically increased employment by expanding the federal government and establishing agencies that would aid in relieving some of the country's worst problems.