Several factors came together. Europe had a population that was on average richer than most other cultures. A very competitive commercial class, ships that were superior than other cultures, developed for the rough North Atlantic, and a number of competitive states rather than a single empire.
The 15th Amendment to the Constitution granted African American men the right to vote by declaring that the "right of citizens of the United States to vote shall not be denied or abridged by the United States or by any state on account of race, color, or previous condition of servitude."
John f kennedy 35th
lyndon b johnson 36th
richard nixon 37th
gerald ford 38th
jimmy carter 39th
ronald reagon 40th
george h bush 41st
bill clinton 42nd
Western Han Dynasty.
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