Joe Biden declared that “democracy has prevailed” after he was sworn in as the 46th president of the United States.
Mr Biden’s inauguration came at a time of national tumult and uncertainty at a US Capitol battered by an insurrectionist siege just two weeks ago.
He said: “The will of the people has been heard, and the will of the people has been heeded. We’ve learned again that democracy is precious and democracy is fragile. At this hour, my friends, democracy has prevailed.
“This is America’s day. This is democracy’s day. A day in history and hope, of renewal and resolve.”
He continued: “Here we stand, just days after a riotous mob thought they could use violence to silence the will of the people.
“To stop the work of our democracy. To drive us from this sacred ground. It did not happen. It will never happen. Not today, not tomorrow. Not ever. Not ever.”
There is no time to waste when it comes to tackling the crises we face. That's why today, I am heading to the Oval Office to get right to work delivering bold action and immediate relief for American families.
— President Biden (@POTUS) January 20, 2021
The president then turned to challenges ahead, acknowledging the surging coronavirus virus that has claimed more than 400,000 lives in the United States.
Mr Biden gazed out over 200,000 US flags planted on the National Mall to symbolise those who could not attend in person.
Flouting tradition, Donald Trump departed Washington on Wednesday morning ahead of the inauguration rather than accompany his successor to the Capitol.
Though three other former presidents — Bill Clinton, George W Bush and Barack Obama — gathered to watch the ceremonial transfer of power, Mr Trump, awaiting his second impeachment trial, instead flew to Florida after stoking grievance among his supporters with the lie that Mr Biden’s win was illegitimate.
Biden, in his third run for the presidency, staked his candidacy less on any distinctive political ideology than on galvanising a broad coalition of voters around the notion that Mr Trump posed an existential threat to American democracy. Mr Biden did not mention Mr Trump by name in his inaugural address but alluded to the rifts his predecessor had helped create.
Mr Biden said: “I know the forces that divide us are deep and they are real. But I also know they are not new. Our history has been a constant struggle between the American ideal that we all are created equal and the harsh, ugly reality of racism, nativism, fear, demonisation that have long torn us apart.
“This is our historic moment of crisis and challenge, and unity is the path forward and we must meet this moment as the United States of America.”
Mr Biden came to office with a well of empathy and resolve born by personal tragedy as well as a depth of experience forged from more than four decades in Washington. Aged 78, he is the oldest president inaugurated.
More history was made at his side, as Kamala Harris became the first woman to be vice president.
The former US senator from California is also the first black person and the first person of South Asian descent elected to the vice presidency and will become the highest-ranking woman ever to serve in government.
Mr Trump did adhere to one tradition and left a note for Mr Biden in the Oval Office, according to the White House, which did not release its contents. And Mr Trump, in his farewell remarks, hinted at a political return, saying: “We will be back in some form.”
And he, without question, will shadow Mr Biden’s first days in office.
Mr Trump’s second impeachment trial could start as early as this week. That could test the ability of the Senate, poised to come under Democratic control, to balance impeachment proceedings with confirmation hearings and votes on Mr Biden’s cabinet choices.
Mr Biden and first lady Jill Biden departed the platform at the Capitol following a ceremony that included musical performances from pop stars Lady Gaga and Jennifer Lopez and country singer Garth Brooks.
Celebrated poet Amanda Gorman read a piece noting that, “while democracy can be permanently delayed, it can never be permanently denied”.
Following the ceremony, Mr Biden entered the White House for the first time as US president after a short walk along Pennsylvania Avenue with a military escort.
Mr Biden and first lady Jill Biden were greeted by a military cordon lining the White House driveway with the flags of US states, leading the first couple to the main entrance under the North Portico.
Mr Biden is expected to immediately begin working, with a number of executive orders on immigration and other key matters awaiting his signature.