Wars do not start out so easily - there must be reasons for war. In addition to reasons, there must be pretexts: you must explain why you are forced to fight. Any big war begins with the aggressor checking whether he can go unpunished? It is one thing to talk about living space and demand the unification of Germans in Greater Germany, another thing to try in practice. For practice you can get it on the head. Hitler's national revolution from the very beginning came into conflict with the policy of the victors in the First World War.
Section of Czechoslovakia. Wars don't start so easy