They believed in a system that rewarded hard work with wealth.
The motto of United States is that it is a country of opportunities where everyone can prosper if they work hard and if they are smart enough, not that it is a country where you have no progress and you stagnate. This was deeply embedded in the mindset of the Americans who firmly believed that with hard work you can progress and get promotions, and run your own business, and get wealthy because they have deserved it, so Marxism came as a very repulsive ideology that was rejected immediately.
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Answer:
The great migration was a mass movement of African Americans during the first, and second, world wars. After being enslaved, and trapped in sharecropping in the Jim Crow south, African Americans were in a dire state of being used and taken advantage of, even after slavery had successfully been abolished. During the first world war, however, most white men were off in Europe fighting within the final year of the first world war. African Americans saw this as an amazing advantage to be able to break free of sharecropping and move farther north where there would be a greater chance for switching from agriculture to industry and factories. So, to recap, African Americans migrated north to escape sharecropping, escape the Jim Crow laws of the south, and become more advantageous in the industries of the north.
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