Neville Chamberlain was a part of the agreement to cede the Sudetenland to Chermany. Don't blame it all on the Frogs.
But it was the French who were adamant about punishing Germany after WWI. If they weren’t so obstinate, Hitler never would have risen to power. Woodrow Wilson, to his credit, tried to talk the French out of it, but they would have none of it.