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The Empire State Building and the antenna of the Bank of America building are lit in red, white and blue beside the Statue of Liberty to mark Biden's projected election in New York City on Saturday. Photo: Gary Hershorn/Getty Images

Cities across the U.S. erupted in celebration and, in some cases, protest on Saturday after Joe Biden was projected to be the winner of the presidential election.

The big picture: Fireworks and honking cars could be heard in Washington, D.C., and Atlanta, and street dancing was on display in New York City, Philadelphia and South Pasadena, among other cities, per AP and Twitter posts.

Supporters of President Trump gathered in Phoenix, Raleigh, Harrisburg and other cities to protest the projected win.

Kamala Harris was cheered as she said in a speech Saturday evening on becoming the first woman and first female person of color to be elected vice president, "While I may be the first woman in this office, I will not be the last."

Fireworks are launched at Biden and Harris' event in Wilmington, Del. Photo: Angela Weiss/AFP via Getty Images
Trump supporters gather in Miami, Florida. Photo: Eva Marie Uzcategui Trinkl/Anadolu Agency via Getty Images
Fireworks are launched at Biden and Harris' event in Wilmington, Del. Photo: Angela Weiss/AFP via Getty Images
Trump supporters rally in front of the Arizona State Capitol in Phoenix. Photo: Olivier Touron/AFP via Getty Images
Supporter Faith Green holds a stuffed toy of Biden as she and others celebrate outside the Chase Center in Wilmington, Del. Photo: Jim Watson/AFP/Getty Images
New York City erupts in celebration of Biden's win. Photo: Tayfun Coskun/Anadolu Agency via Getty Images
Women in Washington, D.C., react to the announcement that Biden has won the 2020 presidential election. Photo: Leigh Vogel/Getty Images for MoveOn
Trump supporters and Black Lives Matter supporters debate in front of the North Carolina Capitol in Raleigh. Photo: Grant Baldwin/AFP via Getty Images
Trump supporters pray in front of the North Carolina Capitol in Raleigh during a "Protect the Results" rally. Photo: Grant Baldwin/AFP via Getty Images
Hundreds of people gather in the state capital of Pennsylvania to display support for Joe Biden. Photo: Spencer Platt/AFP via Getty Images
People celebrate in Times Square in NYC after it was announced that Biden would be the next U.S. president. Photo: Stephanie Keith/Getty Images
Supporters of President Trump march to the State Capitol in Raleigh, N.C. Photo: Grant Baldwin/AFP/Getting Images
People gather in Wilmington, Del., to celebrate Biden's win on Saturday. Photo: Joe Raedle/Getty Images
A Trump supporter looks on outside the Pennsylvania Convention Center after news networks project Biden as the winner of the election. Photo: Bryan R. Smith/AFP via Getty Images
A woman dances as people on Black Lives Matter Plaza across from the White House celebrate Biden's win. Photo: Mandel Negan/AFP via Getting Images
A Trump supporter waves flags as other people celebrate the election of Biden while waiting for the president's motorcade to leave the Trump International Golf Club in Sterling, Va. Photo: Andrew Caballero-Reynolds/AFP via Getty Images
Rep. Eleanor Holmes Norton reacts to the CNN announcement that Biden is the president-elect, as supporters gather in Washington, D.C. Photo: Leigh Vogel/Getty Images for MoveOn

Go deeper: Biden era begins

Editor's note: This article has been updated with more details on the day's developments and further photos.

Go deeper

Mike Allen, author of AM
Jan 21, 2021 - Politics & Policy

Biden-Harris, Day 1: What mattered most

President Joe Biden and first lady Dr. Jill Biden arrive at the North Portico of the White House. Photo: Alex Brandon-Pool/Getty Images

The Axios experts help you sort significance from symbolism. Here are the six Day 1 actions by President Biden that matter most.

Driving the news: Today, on his first full day, Biden translates his promise of a stronger federal response to the pandemic into action — starting with 10 executive orders and other directives, Caitlin Owens writes.

Off the Rails

Episode 8: The siege

Photo illustration: Aïda Amer/Axios. Photos: Mandel Ngan/AFP via Getty Images

Beginning on election night 2020 and continuing through his final days in office, Donald Trump unraveled and dragged America with him, to the point that his followers sacked the U.S. Capitol with two weeks left in his term. Axios takes you inside the collapse of a president with a special series.

Episode 8: The siege. An inside account of the deadly insurrection at the Capitol on Jan. 6 that ultimately failed to block the certification of the Electoral College. And, finally, Trump's concession.

On Jan. 6, White House deputy national security adviser Matt Pottinger entered the West Wing in the mid-afternoon, shortly after his colleagues' phones had lit up with an emergency curfew alert from D.C. Mayor Muriel Bowser.

Dion Rabouin, author of Markets
39 mins ago - Economy & Business

The digital dollar is now high priority for the Fed

Illustration: Aïda Amer/Axios

The U.S. is starting to get serious about a central-bank-backed digital currency, with recent comments from top officials laying out the strongest support yet.

Driving the news: On Tuesday Fed chair Jerome Powell told Congress that developing a digital dollar is a "high priority project for us," but added that there are "significant technical and policy questions."