Joe Biden has officially become the 46th president of the United States.
Mr. Biden has been sworn in at the Inauguration Day ceremony in Washington DC.
Kamala Harris, the first African-American woman ever to be sworn in as vice president, was also sworn in.
Biden defeated on November 3 Donald Trump, who had been president for four years.
In a speech after his inauguration, Biden said he would “work for the development of the United States and the unification of the people.”
He vowed to preserve democracy and respect differences of opinion.
He asked those who did not vote to give him a chance to be heard now he is the president.
During his speech, he asked the participants to observe a moment of silence for those who had been exposed to Covid-19.
Trump did not attend the inauguration and became the first outgoing president to not attend the ceremony since 1869.
