Portal:United States/On this day/April 9

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• 1682 - Robert Cavelier de La Salle discovers the mouth of the Mississippi River, claims it for France and names it Louisiana.
• 1865 - American Civil War: Robert E. Lee surrenders the Army of Northern Virginia (26,765 troops) to Ulysses S. Grant at Appomattox Courthouse, Virginia, effectively ending the war.
• 1867 - Alaska Purchase: Passing by a single vote, the United States Senate ratifies a treaty with Russia for the purchase of Alaska.
• 1909 - The U.S. Congress passes the Payne–Aldrich Tariff Act.
• 1939 - Marian Anderson sings at the Lincoln Memorial, after being denied the right to sing at the Daughters of the American Revolution's Constitution Hall.
• 1942 - World War II: Battle of Bataan/Bataan Death March - United States forces surrender on the Bataan Peninsula. Japanese Navy launches air raid on Trincomalee in Ceylon (Sri Lanka); Royal Navy aircraft carrier HMS Hermes and Royal Australian Navy Destroyer HMAS Vampire are sunk off the island's east coast.
• 1945 - The United States Atomic Energy Commission formed.
• 1947 - The Glazier–Higgins–Woodward tornadoes kill 181 and injure 970 in Texas, Oklahoma, and Kansas.
• 1947 - The Journey of Reconciliation, the first interracial Freedom Ride begins through the upper South in violation of Jim Crow laws. The riders wanted enforcement of the United States Supreme Court's 1946 Irene Morgan decision that banned racial segregation in interstate travel.
• 1953 - Warner Brothers premieres the first 3-D film, entitled House of Wax
• 1959 - Mercury program: NASA announces the selection of the United States' first seven astronauts, which the news media quickly dub the "Mercury Seven".
• 1967 - The first Boeing 737 (a 100 series) takes its maiden flight.
• 1969 - The "Chicago Eight" plead not guilty on federal charges of conspiracy to incite a riot at the 1968 Democratic National Convention in Chicago, Illinois.
• 1992 - US Federal Court finds former Panamanian dictator Manuel Noriega guilty on drug and racketeering charges. He is sentenced to 30 years in prison.
• 2003 - 2003 invasion of Iraq: Baghdad, Iraq falls to American forces.

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