This article includes updates from Wednesday inauguration

Joseph Robinette Biden Jr. became the 46th president of the United States on Wednesday, taking the oath of an office in Washington, D.C., and calling for unity amid a pandemic and divided nation.

In his address to the nation, Biden said, "Democracy has prevailed."

"This is democracy’s day, a day of history and hope, of renewal and resolve," Biden said in the inauguration speech.

On a sunny day at the Capitol, Biden also struck a unifying tone after several weeks of contention about the election results.

"To all those who supported our campaign, I am humbled by the faith you placed in us. To all those who did not support us let me say this, hear me out as we move forward. Take a measure of me and my heart, if you still disagree, so be it. That's democracy," Biden said.

He asked for a moment of silence to remember "all those who were lost this past year" due to the pandemic. The death toll in the U.S. has reached 400,000.

Biden was sworn in by John Roberts, Chief Justice of the Supreme Court. At age 78, Biden is the oldest president to be sworn into the office. 

Donald Trump was not in attendance, but Mike Pence and congressional leaders from both parties came together for the ceremony. Due to the pandemic, only about 1,000 guests were in attendance, including former Presidents Barack Obama, George W. Bush and Bill Clinton. 

Trump disputed the results of the election and refrained from saying Biden's name in his most recent speech. Trump flew to south Florida, where he intends to live at his Mar-a-Lago estate.

Kamala Harris was sworn in as vice-president, the first woman, the first Black American and the first South Asian American to hold the office. Harris was escorted by Eugene Goodman, the Capitol Police officer who confronted a mob of pro-Trump rioters in the Jan. 6 attack of the U.S. Capitol Building.

Biden plans to sign executive orders to undo some Trump administration policies.

Here is a live video of the inauguration.