[319]
Biden's inauguration was "a muted affair unlike any previous inauguration" due to COVID-19 precautions as well as massively increased security measures because of the January 6 United States Capitol attack. Trump did not attend, becoming the first outgoing president since 1869 to not attend his successor's inauguration.[320]

2021
See also: First 100 days of Joe Biden's presidency
In his first two days as president, Biden signed 17 executive orders. By his third day, orders had included rejoining the Paris Climate Agreement, ending the state of national emergency at the border with Mexico, directing the government to rejoin the World Health Organization, face mask requirements on federal property, measures to combat hunger in the United States,[321][322][323][324] and revoking permits for the construction of the Keystone XL pipeline.[325][326][327] In his first two weeks in office, Biden signed more executive orders than any other president since Franklin D. Roosevelt had in their first month in office.[328]
On February 4, 2021, the Biden administration announced that the United States was ending its support for the Saudi-led bombing campaign in Yemen.