Why was Germany involved in world war 2?

The Germans got into WW 2 because they started the war.

Hitler's motives were

* to re-establish the political and military power that Germany had before World War 1,

* to become a global player at eye-level with the U.S.,

* to expand the Reich territory into Eastern Europe (= new "living space" for the Germans),

* to control the Russian & Arabian oil fields,

* to establish satellite regimes in France, Italy and throughout Europe,

* to eliminate Jews and other ethnic minorities regarded as "parasites" not only in Germany, but throughout Europe.