By june of 1940, hitler had already done which of the following? check all that apply..
-he had invaded russia.. he had conquered norway..
-he had conquered great britain.. he had invaded the netherlands.
-he had pushed allied forces out of france..
-he had forced the united states to join the war.

The answer is the forth one. By June of 1940, Hitler had already done forced the United States to join the war. And in 1941, Adolf Hitler announces war on the United States, convey America, which had been nonpartisan, into the European clash. He was persuaded that the United States would soon get the best of him and pronounce war on Germany.