On June 18, 1778, American forces entered Philadelphia as the British withdrew during the Revolutionary War.

In 1812, the War of 1812 began as the United States Congress approved, and President James Madison signed, a declaration of war against Britain.

In 1815, Napoleon Bonaparte was defeated in the Battle of Waterloo as British and Prussian troops defeated the French Imperial Army in Belgium.

In 1979, President Jimmy Carter and Soviet President Leonid Brezhnev signed the SALT II strategic arms limitation treaty in Vienna.

In 2020, the Supreme Court, in the case of Department of Homeland Security v. Regents of the University of California, rejected by a 5-4 decision President Donald Trump’s effort to end legal protections for more than 650,000 young immigrants.