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So that the president of the USA can recite the oath of office.
Next occurrence will happen on December 1, 2012.
The 2009 inauguration of Barack Obama occurred because he had been elected as the 44th President of the United States. Inaugurations are ceremonial events that mark the beginning of a new presidential term, providing an opportunity for the President-elect to take the oath of office and deliver an inaugural address. Obama's inauguration was significant as it marked the first time an African American was elected to the highest office in the country.
Incoming Forces happened in 2002.
2009
In Washington D.C
Inauguration of Benjamin Harrison happened on 1889-03-04.
Inauguration of James Buchanan happened on 1857-03-04.
Inauguration of Herbert Hoover happened on 1929-03-04.
Inauguration of James A. Garfield happened on 1881-03-04.
Inauguration of Barack Obama happened on 2009-01-20.
Inauguration of Jimmy Carter happened on 1977-01-20.