The Pearl Harbor succession would be Wallace, not Truman

How would the war change if Franklin D. Roosevelt died after hearing of the Pearl Harbor attack?

Henry A. Wallace, not Truman, would succeed Roosevelt in December 1941, placing the war under a very different president.

The initial answer imagines Harry Truman taking power, then corrects the premise: in December 1941 the vice president was Henry A. Wallace, not Truman. The speculation still makes a useful point about political development, because the Truman who became president in 1945 had been changed by observing Roosevelt and by the pressures of the war. A 1941 succession would therefore not simply move the 1945 Truman administration four years earlier, and Wallace would lead from a very different political position. The correction is central to the counterfactual rather than a minor name change. Constitutional succession and leaders' wartime experience constrain alternate history.