Mount Tambora in the Dutch East Indies blows its top during an eruption event. Upwards of 92,000 are killed during this eruption. The event is the cause of 1816 becoming known as the Year Without a Summer.
The U.S. Congress passes an act to "prohibit the importation of slaves into any port or place within the jurisdiction of the United States from any foreign kingdom, place, or country."
The Alien and Sedition Acts become United States law making it a federal crime to write, publish, or utter false or malicious statements about the United States government.
The Case of the Lyons Mail: during the night of April 27, five highwaymen attack the mail between Paris and Lyon kill the postmen, and steal the funds sent to the armies in Italy.