March 2 - The United States 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."
March 25 - The Slave Trade Act becomes law abolishing slavery in the Kingdom of Great Britain and Ireland.
September 1 - Former US Vice President Aaron Burr is acquitted of treason. He had bee accused of plotting to annex parts of Louisiana and Mexico to become part of an independent republic.