Donald Trump was sworn in as the 45th President of the United States in a ceremony on Capitol Hill on January 20.
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The National Park Service said there would be no official crowd estimate for Trump’s inauguration. Obama’s first inauguration, in 2009, is widely believed to have set the record for most well attended, at an estimated 1.8 million people. President Bill Clinton attracted an estimated 800,000 people to his first inauguration. Bush attracted about 300,000 to his second inauguration, in 2005.