Hitler felt that the Germans lost much of its land due to the (Treaty of Versailles)
, which was signed after World War I. As per the Treaty, the Allies would control ?

Alsace and Lorraine that was given to France, northern Schleswig was given to Denmark, part of territory to Belgium, while Saarland was under the control of League of Nations. German colonies were all given to Allies, mostly France and Britain.

Explanation:

Treaty of Versailles was seen in Germany as a national shame as they lost a lot of territories and also had to accept conditions that they considered shameful. Hitler wanted to use the dissatisfaction of Germans to bring some territories back under the control of Germany.

there are more but this is what i can come up

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