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.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.