"Pat jumps the shark on this line. Hitler invaded France long before we entered WWII. And Hitler declared war on us before we declared war on him."
Actually he is referring to britain and france declaring war on germany, which they did when he invaded poland. You are thinking of the United States, which came 2 yrs later.
You're right. As did Stalin. His receipe for a kindler, gentler Poland is half Hitler, who would have liquidated the Poles, and half Stalin, who would have liquidated the Poles. In either case Poland exists no more. The distinction isn't clear to me.