Joe Biden and Kamala Harris were officially sworn in as US president and vice president during a historic inauguration in a highly fortified Washington.
The ceremony came only two weeks after a violent insurrection at the US Capitol by pro-Trump rioters.
Ms Harris became the first woman vice president of the US.
In his first hours as president in the Oval Office, Mr Biden signed more than a dozen executive orders on issues including immigration, Covid-19, the environment and the economy.
Former president Donald Trump skipped the inauguration of Mr Biden, a first in modern history. Here's how the day unfolded: