The reasons that German forces aggressively expanded into neighboring countries in the late 1930s includes:
- to unite German-speaking peoples
- to stop Polish expansion into the Sudetenland
- to reclaim lands lost after World War I
- to bring European Jews to Germany
Some of the aggressive action includes Germany's militarization of the Rhineland, annexation of Austria, and aggression against Czechoslovakia, the Stalin-Hitler Pact of 1939, and the German attack on Poland.
Hence, the Option 1, 3,4 and 5 is correct.
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