US President Joe Biden has begun rolling back some key Donald Trump policies, hours after he was sworn in.
Other orders reflected the Trump administration's stance on climate change and immigration.
President Biden prepared to work in the Oval Office after he was sworn in earlier Wednesday at the U.S. Capitol.
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The opening was different than anywhere else due to coronavirus restrictions, with few attending to watch the swearing-in and ceremonies.
Donald Trump - who has yet to formally hand over the presidency to Biden - ignored the event in a departure from a long-running precedent.
"Democracy has triumphed," President Biden said after he was sworn in with Chief Justice John Roberts.
By sending a message of unity after Trump's tumultuous years, he promised to be president of "all Americans" - including those who voted against him.
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Three of his predecessors attended the party: Barack Obama - who served Biden for eight years as Vice President - Bill Clinton and George W. Bush, as well as Trump Vice President Mike Pence.
Kamala Harris was sworn in as Vice President in front of Biden. She is the first woman - and the first black and Asian American woman - to serve in the role.
There was tight security for the ceremony at the U.S. Capitol after the building was stormed by pro-Trump protesters on January 6.
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Biden and first lady Jill Biden, together with Mrs. Harris and her husband Doug Imhoff, walked down Pennsylvania Avenue to the White House to greet friends and supporters.
The opening ceremony included musical performances by Lady Gaga - who sang the national anthem - as well as Jennifer Lopez and Garth Brooks.
Amanda Gorman, America's first youth patriotic poet, recited her work The Hill We Climb.
Today, @POTUS rejoined the Paris Climate Agreement, restoring America’s credibility and commitment — setting a floor, not a ceiling, for our climate leadership. Working together, the world must and will raise ambition. It’s time to get to work - the road to Glasgow begins here.
— Special Presidential Envoy John Kerry (@ClimateEnvoy) January 20, 2021
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Mr. Biden's climate envoy, former US Secretary of State John Kerry, tweeted that the commitment had set "a floor, not a ceiling" for climate leadership in America and urged international cooperation ahead of the UN Climate Change Conference (Cop26) in Glasgow in November. .
Biden also revoked the presidential permit granted to the controversial Keystone XL pipeline, which had fought environmentalists and Native American groups for more than a decade.
White House Press Secretary Jane Psaki said the move will be discussed when Biden has his first phone call to a foreign leader - Canadian Prime Minister Justin Trudeau - on Friday.
The privately funded pipeline - estimated to cost about $ 8 billion (£ 5.8 billion) - will carry around 830,000 barrels of heavy crude per day from the Alberta oil sands in Canada to Nebraska.
Barack Obama vetoed a bill approving construction of the pipeline in 2015, but President Trump vetoed the decision.


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