April 22 events in history

238 Year of the Six Emperors: The Roman Senate outlaws emperor Maximinus Thrax for his bloodthirsty proscriptions in Rome and nominates two of its members, Pupienus and Balbinus, to the throne
1500 Portuguese navigator Pedro Álvares Cabral lands in Brazil
1519 Spanish conquistador Hernán Cortés establishes a settlement at Veracruz, Mexico
1529 Treaty of Zaragoza divides the eastern hemisphere between Spain and Portugal along a line 297.5 leagues or 17° east of the Moluccas
1622 The Capture of Ormuz by the East India Company ends Portuguese control of Hormuz Island
1809 The second day of the Battle of Eckmühl: the Austrian army is defeated by the First French Empire army led by Napoleon I of France and driven over the Danube in Regensburg
1836 Texas Revolution: A day after the Battle of San Jacinto, forces under Texas General Sam Houston identify Mexican General Antonio López de Santa Anna among the captives of the battle when one of his fellow captives mistakenly gives away his identity
1864 The U.S. Congress passes the Coinage Act of 1864 that mandates that the inscription In God We Trust be placed on all coins minted as United States currency
1876 The first ever National League baseball game is played in Philadelphia
1889 At high noon, thousands rush to claim land in the Land Rush of 1889. Within hours the cities of Oklahoma City and Guthrie are formed with populations of at least 10,000
1898 Spanish–American War: The USS Nashville captures a Spanish merchant ship
1906 The 1906 Summer Olympics, not now recognized as part of the official Olympic Games, open in Athens
1911 Tsinghua University, one of mainland China's leading universities, is founded
1912 Pravda, the "voice" of the Communist Party of the Soviet Union, begins publication in Saint Petersburg
1915 The use of poison gas in World War I escalates when chlorine gas is released as a chemical weapon in the Second Battle of Ypres
1930 The United Kingdom, Japan and the United States sign the London Naval Treaty regulating submarine warfare and limiting shipbuilding
1944 The 1st Air Commando Group using Sikorsky R-4 helicopters stage the first use of helicopters in combat with combat search and rescue operations in the China-Burma-India theater
1944 World War II: Operation Persecution is initiated – Allied forces land in the Hollandia (currently known as Jayapura) area of New Guinea
1945 World War II: Prisoners at the Jasenovac concentration camp revolt. Five hundred twenty are killed and 80 escape
1945 World War II: Führerbunker: After learning that Soviet forces have taken Eberswalde without a fight, Adolf Hitler admits defeat in his underground bunker and states that suicide is his only recourse
1948 1948 Arab–Israeli War: Haifa, a major port of Israel, is captured from Arab forces
1951 Korean War: The Chinese People's Volunteer Army begin assaulting positions defended by the Royal Australian Regiment and the Princess Patricia's Canadian Light Infantry at the Battle of Kapyong
1954 Red Scare: Witnesses begin testifying and live television coverage of the Army–McCarthy hearings begins
1964 The 1964-1965 New York World's Fair opens for its first season
1969 British yachtsman Sir Robin Knox-Johnston wins the Sunday Times Golden Globe Race and completes the first solo non-stop circumnavigation of the world
1970 The first Earth Day is celebrated
1972 Vietnam War: Increased American bombing in Vietnam prompts anti-war protests in Los Angeles, New York City, and San Francisco
1977 Optical fiber is first used to carry live telephone traffic
1983 The German magazine Stern claims that the "Hitler Diaries" had been found in wreckage in East Germany; the diaries are subsequently revealed to be forgeries
1992 In an explosion in Guadalajara, Mexico, 206 people are killed, nearly 500 injured and 15,000 left homeless
1993 Version 1.0 of the Mosaic web browser is released
1997 Haouch Khemisti massacre in Algeria – 93 villagers killed
1997 The Japanese embassy hostage crisis ends in Lima, Peru
1998 Disney's Animal Kingdom opens at Walt Disney World near Orlando, Florida, United States
2000 In a pre-dawn raid, federal agents seize six-year-old Elián González from his relatives' home in Miami
2000 The Big Number Change takes place in the United Kingdom
2004 Two fuel trains collide in Ryongchon, North Korea, killing up to 150 people
2005 Japan's Prime Minister Junichiro Koizumi apologizes for Japan's war record
2008 The United States Air Force retires the remaining F-117 Nighthawk aircraft in service
2013 6 people die in a shooting in Belgorod, Russia
2013 The Royal Canadian Mounted Police arrest and charge two men with plotting to disrupt a Toronto area train service in a plot claimed to be backed by Al-Qaeda elements
2014 More than 60 people are killed and 80 are seriously injured in a train crash in the Democratic Republic of the Congo's Katanga Province