What caused the balance of power to shift in europe in the years leading up to the war?

The balance of power began to shift after the American troops left Germany in 1924 and continued through to the Great Depression when England and France could not get back any reparations along with the propaganda proposed by Hitler began to turn the tables . When Germany started to rearm without approval the nations basically did not do anything because the armed services were diminished and their economies were crippled .