Who was in charge of the US during World War 2?

Answer 1

There was no single commander of either the US forces, or the Allied forces. Instead, the Unified Anglo-American Command (often called the Allied Command) was set up to command all American, British (and British Empire/Commonwealth), Dutch, French, and other western-oriented (i.e. non-Communist) forces. The world was then divided up into areas of action, with a supreme commander being assigned to each region. Sometimes that commander was American, sometimes British, and occasionally even Dutch or Australian. But that individual commanded all Allied forces in the region, regardless of actual nationality.

In addition, the commanders occasionally changed, so you can't even say that person X commanded region Y for the duration of WW2.

A rough estimate is that there were between 12 and 20 supreme commanders worldwide over the course of the war.

What many people think of when "Supreme Allied Commander" is mention was General Dwight D. Eisenhower's appointment in December of 1943 to be in charge of the Normandy invasion. He directed the "D-day" invasion of Europe in June 1994, and was in command of the main Western combined forces in France, the Low Countries, and Germany from then until the German surrender on May 7, 1945. However, there were many areas of operations in Europe which Eisenhower has no power over; for example, the Combined Bomber Offensive (the US 8th Airforce and British Bomber Command), the forces in Italy, North Africa, and the Balkans, Operation Dragoon in southern France, and, most especially, the Soviet forces in Eastern Europe, all fell outside his control. And he certainly had no command over anything outside the Western European theater.

In reality, the closest thing that the US would have to a supreme military commander world wide would have been General George C. Marshall, the US Army Chief of Staff and Admiral Ernest J. King, the Chief of Naval Operations. Both were superiors to any local theater commander; however, both occupied critical administrative, rather than combat, roles. Marshall in particular is credited as being the prime organizer behind the massive US industrial output of WW2, and the man mostly responsible for seeing that the US outproduced every other country by a wide margin.

Answer 2

During ww2 us had Franklin Rosevelt in charge