On March 30, 1822, Florida became a United States territory.

In 1867, U.S. Secretary of State William H. Seward reached agreement with Russia to purchase the territory of Alaska for $7.2 million, a deal ridiculed by critics as “Seward’s Folly.”

In 1870, the 15th Amendment to the U.S. Constitution, which prohibited denying citizens the right to vote and hold office on the basis of race, was declared in effect by Secretary of State Hamilton Fish.

In 1981, President Ronald Reagan was shot and seriously wounded by John Hinckley Jr. outside a Washington, D.C., hotel.

In 2023, a Manhattan grand jury voted to indict Donald Trump on charges involving payments made during the 2016 presidential campaign to silence claims of an extramarital sexual encounter, the first ever criminal case against a former U.S. president.