Why was Germany so succesful in its early military victories? Discuss the part of the Allies in Germany's early success. Why was Germany so succesful...

These are
very thorough answers, but in short the world did not take Hitler seriously because he was not
their problem.  He was targeting Jews, an unpopular people, and he was in a country far away
targeting other countries we were not allied with.  Until he attacked England and France, we
stayed out of it.