Democrat Joe Biden was on Wednesday (Jan 20) sworn in as the 46th President of the United States.
With his hand on a five-inch thick heirloom Bible that has been in his family for more than a century, Biden took the oath of office administered by US Chief Justice John Roberts that binds the president to "preserve, protect and defend the Constitution of the United States".
Biden, 78, became the oldest US president in history at a scaled-back ceremony in Washington that was largely stripped of its usual pomp and circumstance, due both to the coronavirus and security concerns following the Jan 6 assault on the US Capitol by supporters of outgoing President Donald Trump.
The norm-defying Trump flouted one last convention on his way out of the White House when he refused to meet with Biden or attend his successor's inauguration, breaking with a political tradition seen as affirming the peaceful transfer of power.
Trump, who never conceded the Nov 3 election, did not mention Biden by name in his final remarks as president on Wednesday morning, when he touted his administration's record and promised to be back "in some form". He boarded Air Force One for the last time and headed to his Mar-a-Lago retreat in Florida.
Top Republicans, including Vice President Mike Pence and the party's congressional leaders, attended Biden's inauguration, along with former US Presidents Barack Obama, George W Bush and Bill Clinton.
Biden's running mate, Kamala Harris, the daughter of immigrants from Jamaica and India, became the first black person, first woman and first Asian American to serve as vice president after she was sworn in by US Supreme Court Justice Sonia Sotomayor, the court's first Latina member.
Biden takes office at a time of deep national unease, with the country facing what his advisers have described as four compounding crises: The pandemic, the economic downtown, climate change and racial inequality. He has promised immediate action, including a raft of executive orders on his first day in office.
After a bitter campaign marked by Trump's baseless allegations of election fraud, Biden struck a conciliatory tone, asking Americans who did not vote for him to give him a chance to be their president as well.
"To overcome these challenges to restore the soul and secure the future of America requires so much more than words. It requires the most elusive of all things in a democracy: Unity," he said. "We must end this uncivil war that pits red against blue, rural versus urban, conservative versus liberal. We can do this - if we open our souls instead of hardening our hearts."
The ceremony on Wednesday unfolded in front of a heavily fortified US Capitol, where a mob of Trump supporters stormed the building two weeks ago, enraged by his false claims that the election was stolen with millions of fraudulent votes.
The violence prompted the Democratic-controlled US House of Representatives to impeach Trump last week for an unprecedented second time.
Thousands of National Guard troops were called into the city after the siege, which left five people dead and briefly forced lawmakers into hiding. Instead of a throng of supporters, the National Mall on Wednesday was covered by nearly 200,000 flags and 56 pillars of light meant to represent people from US states and territories.