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A large migration of southern black Americans to more urban areas during the industrial revolution. This led to jobs being scarce unemployment of many in the 1920’s
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The first world wide intergovernmental organization whose main goal is to maintain world peace. They would do so by using collective security, disarmament, and negotiation. The US did not join at the time.
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This time period was known as the roaring twenties as the US was the richest and most developed state aka the worlds first major superpower.
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The isolation policy had made it so the US did not join the League of Nations, they put high tariffs to reduce international trade, it limited immigration from Europe and Japan, and moved US politics to conservatism.
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Charles Lindbergh made the first solo transatlantic flight becoming a bog celebrity
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The first airline is founded and is used to deliver mail. The first route was from Key West to Havanah.
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The Great depression started when the stock market collapse making the global economy crash completely. This led to food shortages and poverty throughout the world.