‘When times change, so must we’

And to the world's leaders, Obama pledged to be "forever vigilant against those who would do us harm." But he also said the country would show "the courage to try and resolve our differences with other nations peacefully - not because we are naïve about the dangers we face, but because engagement can more durably lift suspicion and fear."

In attendance

Former President Bill Clinton and wife Hillary

Former President Jimmy Carter and wife Rosalynn

Senator John McCain

House Budget Committee Chairman Rep. Paul Ryan

FBI Director Robert Mueller

Chicago Mayor Rahm Emanuel

Beyonce

Jay-Z

John Mayer and Katy Perry

Kelly Clarkson

James Taylor and wife Kim

INAUGURAL FIRSTS

There's nothing like an inauguration to send a tingle up the spines of history lovers and patriots. The Joint Congressional Committee on Inaugural Ceremonies put together a comprehensive guide to all things inaugural. Here are some highlights, from past to present:

In 1793 in Philadelphia, George Washington delivers what remains to this day the shortest inaugural address - 135 words.

In 1801, Thomas Jefferson became the first president inaugurated in Washington DC

In 1809, James Madison held the first inaugural ball. Tickets were $4.

In 1825, John Quincy Adams became the first president to wear long pants, instead of knee breeches, for his swearing-in.

In 1837, Martin Van Buren became the first president who was not born a British subject.

In 1865, at Abraham Lincoln's second inauguration, African-Americans participated in the inaugural parade for the first time.

In 1921, Warren G. Harding became the first president to ride to and from his inauguration in an automobile.

In 1929, Herbert C. Hoover's inauguration was the first recorded by talking newsreel.

In 1937, Franklin D. Roosevelt became the first president sworn in on January 20.

In 1949, Harry S. Truman's inauguration was the first to be televised.

... contd.

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