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  Many Jews were fleeing from persecution. Many immigrants made their way to the US and so the immigration policy formed later on.
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  This act limited the number of immigrants allowed in the United States.
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        Herbert Hoover becomes the 31st President of America - 
  
  The stock market crashed due to a 4-day crash due to the Great Depression.
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        Franklin D. Roosevelt becomes the 32nd President of America - 
  
  Hitler becomes the supreme leader of Germany. The entire control is in his hands.
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        The Second World War begins as Britain and France declared war on Germany. - 
  
  The Japanese attacked Pearl Harbor in Hawaii making the United States join the 2nd World War.