Hitler believed in the Aryan race. He believed they were stronger, more successful, and just better in general. He wanted to rid the world of people who were not of this race, in order to create a "better" world.
The transcontinental railroad allowed for the transportation of goods over long distances. This was especially helpful for the industrial north at the time.
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The flexible response was created and implemented during former President John F. Kennedy's administration at the year 1961 as a measure to counteract the New Look policy of former President Dwight Eisenhower in his policy of conducting a massive military action in case of war.
