Former President Barack Obama was spotted at the inauguration of Donald Trump. See pictures of the former president here.

Donald Trump is set to be sworn in as the 47th president, but he was already the 45th, leading some to wonder what the 45-47 ...

In 2009, Barack Obama was sworn in as the United States' 44th president and the nation's first Black chief executive. In 2010 ...

Who are the living presidents after Jimmy Carter's passing and how old are they now? Donald Trump, Bill Clinton and George W.

Like his presidential campaign, the festivities surrounding Barack Obama's swearing-in as the nation's 44th president were financed by private donations, a practice that goes back many administrations ...