US government and appeasement of the Nazis

There is no popular factual history of the US role in WWII.  Since I came to US, I was struck that popular culture about the war are so wrong and based on fallacies and propaganda.  Take the notorious appeasement policies of  Neville Chamberlain.  The disgraceful policies of appeasement (which certainly facilitated the expansion of the rule of Hitler--he even was expecting a stronger French and British reaction to his provocations in 1938) were not entirely Chamberalain's.  FDR was also an appeaser and sent a telegram to Chamberlain congratulating him on his peace talks with Hitler, on the eve of Munich.