Even as Hitler invaded Poland in 1939, only one in forty Americans thought America should get involved. This was the world that FDR faced as he tried to reshape America's vision and it’s place in the world. He reminded the country that it had a “rendezvous with destiny.”
He would succeed in persuading America. How he did it, is the the subject of Rendezvous with Destiny: How Franklin D. Roosevelt and Five Extraordinary Men Took America into the War and into the World by Michael Fullilove.
My conversation with Michael Fullilove: