Joe Biden became the 46th President of the United States after being sworn in by Chief Justice John Roberts.
“Democracy has triumphed,” the new president said after the oath.
Donald Trump, who has not formally acknowledged losing the presidential race to Biden, did not participate in the inauguration.
The new president announced a set of executive orders aimed at changing key policies that Trump adopted during his tenure in office.
Kamala Harris was sworn in as the Vice President, becoming the first woman to hold the position.
The inauguration ceremony was held at the US Capitol. Which is subject to extremely tight security after being stormed by pro-Trump demonstrators in bloody riots on January 6.
About 25,000 National Guard members protected the ceremony, which hundreds of thousands of people missed due to the Coronavirus pandemic.
How did the inauguration day go?
“The goal of what I will work on is to reunite America again,” Biden said, in his speech at the inauguration.
In his speech, the new president highlighted the message of unity, promising to be president of “all Americans” – including those who voted against him.
And participated in the inauguration ceremony three former presidents: Barack Obama – of whom Biden was his deputy for eight years – and Bill Clinton and George W. Bush.
Mike Pence, Trump’s vice president, also attended the inauguration.
The opening ceremony included musical performances in which the actress Lady Gaga sang the national anthem, as well as Jennifer Lopez and Garth Brooks.
Earlier on Wednesday, Biden, 78, attended a mass at a cathedral in Washington – along with four Catholic congressional leaders, both Democrats and Republicans.