Would America enter without Pearl Harbor?

Would the United States be less involved if Japan had not attacked?

In this counterfactual, America remains formally outside the war at the end of 1941, with German-American friction still expected to produce conflict later, tentatively around 1942 or 1943.

Japan's attack was not the only source of American involvement, but it accelerated the transition into open war. Without Pearl Harbor, the United States would probably remain formally outside the conflict at the end of 1941. Escalating Atlantic friction with Germany would still be likely to boil over, perhaps in 1942 or 1943 rather than immediately.