A German-American clash remained likely without Hitler's declaration

What if Hitler did not declare war on the United States after Pearl Harbor?

War would probably still follow within months through Allied cooperation and a likely German-American naval incident.

Britain and America were already becoming allies through the Pacific war. German and Italian submarines operating into the Indian Ocean and Southeast Asia needed only to sink or attack an American ship for open war to follow. Hitler's declaration accelerated a confrontation that was already likely.