9-4-193
Septimius Severus is proclaimed Roman Emperor by the army in Illyricum (in the Balkans).
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9-4-475
Byzantine Emperor Basiliscus issues a circular letter (Enkyklikon) to the bishops of his empire, supporting the Monophysite christological position.
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9-4-1241
Battle of Liegnitz: Mongol forces defeat the Polish and German armies.
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9-4-1413
Henry V is crowned King of England.
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9-4-1440
Christopher of Bavaria is appointed King of Denmark.
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9-4-1682
Robert Cavelier de La Salle discovers the mouth of the Mississippi River, claims it for France and names it Louisiana.
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9-4-1782
American War of Independence: Battle of the Saintes begins.
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9-4-1860
The oldest audible sound recording of a human voice is made.
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9-4-1865
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.
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9-4-1867
Alaska purchase: Passing by a single vote, the United States Senate ratifies a treaty with Russia for the purchase of Alaska.
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9-4-1909
The U.S. Congress passes the Payne-Aldrich Tariff Act.
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9-4-1916
World War I: The Battle of Verdun – German forces launch their third offensive of the battle.
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9-4-1917
World War I: The Battle of Arras – the battle begins with Canadian Corps executing a massive assault on Vimy Ridge.
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9-4-1918
World War I: The Battle of the Lys – the Portuguese Expeditionary Corps is crushed by the German forces during what is called the Spring Offensive on the Belgian region of Flanders.
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9-4-1937
The Kamikaze arrives at Croydon Airport in London – it is the first Japanese-built aircraft to fly to Europe.
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9-4-1939
Marian Anderson sings at the Lincoln Memorial, after being denied the right to sing at the Daughters of the American Revolution's Constitution Hall.
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9-4-1940
World War II: Operation Weserübung – Germany invades Denmark and Norway.
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9-4-1942
World War II: The Battle of Bataan/Bataan Death March – United States forces surrender on the Bataan Peninsula. The Japanese Navy launches an 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.
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9-4-1945
World War II: The German pocket battleship Admiral Scheer is sunk.
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9-4-1945
World War II: The Battle of Königsberg, in East Prussia, ends.
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9-4-1945
The United States Atomic Energy Commission is formed.
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9-4-1947
The Glazier-Higgins-Woodward tornadoes kill 181 and injure 970 in Texas, Oklahoma, and Kansas.
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9-4-1947
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.
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9-4-1948
Jorge Eliécer Gaitán's assassination provokes a violent riot in Bogotá (the Bogotazo), and a further ten years of violence in Colombia known as La violencia.
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9-4-1948
Massacre at Deir Yassin.
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9-4-1952
Hugo Ballivian's government is overthrown by the Bolivian National Revolution, starting a period of agrarian reform, universal suffrage and the nationalisation of tin mines
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9-4-1957
The Suez Canal in Egypt is cleared and opens to shipping.
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9-4-1959
Project Mercury: NASA announces the selection of the United States' first seven astronauts, whom the news media quickly dub the "Mercury Seven".
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9-4-1965
Astrodome opens. First indoor baseball game is played.
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9-4-1967
The first Boeing 737 (a 100 series) makes its maiden flight.
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9-4-1968
Funeral of Martin Luther King, Jr.
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9-4-1969
The "Chicago Eight" plead not guilty to federal charges of conspiracy to incite a riot at the 1968 Democratic National Convention in Chicago, Illinois.
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9-4-1969
The first British-built Concorde 002 makes its maiden flight from Filton to RAF Fairford.
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9-4-1975
The first game of the Philippine Basketball Association, the second oldest professional basketball league in the world.
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9-4-1975
8 people in South Korea, who were involved in People's Revolutionary Party Incident, are hanged.
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9-4-1980
The Iraqi regime of Saddam Hussein kills philosopher Muhammad Baqir al-Sadr and his sister Bint al-Huda after three days of torture.
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9-4-1989
The April 9 tragedy in Tbilisi, Georgian SSR an anti-Soviet peaceful demonstration and hunger strikes, demanding restoration of Georgian independence is dispersed by the Soviet army, resulting in 20 deaths and hundreds of injuries.
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9-4-1992
A U.S. Federal Court finds former Panamanian dictator Manuel Noriega guilty of drug and racketeering charges. He is sentenced to 30 years in prison.
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9-4-1992
John Major's Conservative Party wins an unprecedented fourth general election victory in the United Kingdom.
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9-4-2003
2003 invasion of Iraq: Baghdad falls to American forces;Saddam Hussein statue topples as Iraqis turn on symbols of their former leader, pulling down the statue and tearing it to pieces.
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9-4-2005
Wedding of Charles, Prince of Wales and Camilla, Duchess of Cornwall; Charles, Prince of Wales marries Camilla Parker Bowles in a civil ceremony at Windsor's Guildhall.