Appeasement is frequently mentioned on this thread but what isn't mentioned is the Treaty of Versailles which had it been less severe and less 'not letting Germany get away with it' you may have been re-writing history not to have included the rise of Hitler.
The problem with Versailles was it ended up being neither one thing nor the other.
The French wanted to basically destroy Germany as a nation, turn it back into a medieval serfdom reliant on agriculture. The Americans wanted to give them a slapped wrist, accept they started it and pay some reparations to France and the Low Countries and then let them get on with it. As per usual, the British in the middle tried to fudge it and ended up with the half-cocked outcome which led to the rise of the Nazis.