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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

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The top Republicans who have acknowledged Biden as president-elect

Photo: Tasos Katopodis/Getty Images

Some elected Republicans are breaking ranks with President Trump to acknowledge that President-elect Biden won the 2020 presidential election.

Why it matters: The relative sparsity of acknowledgements highlights Trump's lasting power in the GOP, as his campaign moves to file multiple lawsuits alleging voter fraud in key swing states — despite the fact that there have been no credible allegations of any widespread fraud anywhere in the U.S.

Updated 28 mins ago - Politics & Policy

Sen. Kelly Loeffler to return to campaign trail after 2nd negative test

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Sen. Kelly Loeffler's (R-Ga.) campaign announced Monday that she "looks forward to getting back out on the campaign trail" after testing negative for COVID-19 for a second time, following earlier conflicting results.

Why it matters: Loeffler has been campaigning at events ahead of a Jan. 5 runoff in elections that'll decide which party holds the Senate majority. Vice President Mike Pence was with her on Friday.

Updated 5 hours ago - Politics & Policy

Key government agency says Biden transition can formally begin

General Services Administrator Emily Murphy. Photo: Alex Edelman/CNP/Getty Images

General Services Administrator Emily Murphy said in a letter to President-elect Joe Biden on Monday that she has determined the transition from the Trump administration can formally begin.

Why it matters: Murphy, a Trump appointee, had come under fire for delaying the so-called "ascertainment" and withholding the funds and information needed for the transition to begin while Trump's legal challenges played out.