Hitler was confident that the western states that had signed the treaty of versailles would

Not use force to maintain it

Explanation:

The treaty was signed in June 1919 at the end of World War 1. The treaty mentioned Germany as the starters of the war and imposed several penalties such as loss of territory, demilitarization on Germany.

Economic hardship and Hatred for the treaty in Germany was what caused the rise of Adolf Hitler and his Nazis and two decades after the World war 2.