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You asked:

when did barack obama become the president of us

  • Tuesday January 20th 2009 and Tuesday 5:01 p.m. on January 20th 2009.
  • Barack Obama
    Barack Obama
    the United States
    the United States
    January 20th 2009

    January 20th in the year 2009

  • 5:01 p.m. on January 20th 2009

    5:01 p.m. on January 20th in the year 2009