I would go with Brown v Board of Education. It gave more rights to African Americans and made them one step closer into beating segregation. Through the court case, segregation in schools was deemed unconstitutional, and so was segregation in other public places.
Http://www.theworldeconomy.org/impact/Portugal_s_major_advantages.html This should answer your question
Answer: 1620 is the year the Mayflower landed on North American land, whichc was the first european people on america
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