Joe Biden was declared the winner of the 2020 United States presidential election, defeating incumbent President Donald Trump. This election followed a tumultuous political climate marked by heightened partisanship, social unrest, and a global pandemic. Throughout the days leading up to the announcement, states such as Pennsylvania, Georgia, and Arizona were pivotal, with their counts being closely monitored. As more mail-in ballots were counted, Biden's lead expanded, affirming his victory. Voter enthusiasm was palpable, as turnout reached historic levels, with over 159 million Americans casting their votes, representing about 66.7% of the eligible voter population. The significant early voting facilitated by the pandemic allowed both candidates to campaign effectively, albeit within a limited scope due to health concerns.

Biden's victory signified a shift in political sentiment among the American electorate, with many voting against Trump's approach to major issues such as the COVID-19 pandemic, racial justice, and climate change. The emotions following the announcement were mixed across the nation, with celebrations erupting in cities like New York and Philadelphia, contrasting with protests from Trump supporters who claimed electoral fraud without substantial evidence. The election was consequential for not just the presidency but also for the future of American governance, highlighting the critical role of mail-in voting and the challenges faced by the electoral process in unprecedented times.

The aftermath of the election saw significant legal challenges by the Trump campaign in several states, questioning the validity of votes and alleging widespread fraud, which was largely dismissed in court reviews. Biden announced plans for several key appointments and policy directions that aimed to restore normalcy and address the pressing needs of a nation deeply affected by the previous administration's decisions.