*. 1906– San Francisco public school board sparks a diplomatic crisis between the United States and Japan by ordering Japanese students to be taught in racially segregated schools.
*. 1910– Former President Theodore Roosevelt becomes the first U.S. president to fly in an airplane. He flew for four minutes with Arch Hoxseyin a plane built by the Wright brothers at Kinloch Field ( Lambert–St. Louis International Airport), St. Louis, Missouri.
*. 1912– First Balkan War: The Greek Army liberates the city of Kozani.
*. 1918– San Fermín earthquake hits western Puerto Rico.
*. 1929– J. C. Penney opens store #1252 in Milford, Delaware, making it a nationwide company with stores in all 48 U.S. states.
*. 1950– Television: CBS's mechanical color system is the first to be licensed for broadcast by the U.S. Federal Communications Commission.
*. 1962– Second Vatican Council: Pope John XXIII convenes the first ecumenical council of the Roman Catholic Church in 92 years.
*. 1968– Apollo program: NASA launches Apollo 7,the first successful manned Apollo mission, with astronauts Wally Schirra, Donn F. Eiseleand Walter Cunningham aboard.
*. 1972– A race riot occurs on the United States Navy aircraft carrier Kitty Hawk off the coast of Vietnam during Operation Linebacker.
*. 1976– George Washington's appointment, posthumously, to the grade of General of the Armies by congressional joint resolution Public Law 94-479 is approved by President Gerald R. Ford.
*. 1982– The Mary Rose, a Tudor carrack which sank on July 19, 1545, is salvaged from the sea bed of the Solent, off Portsmouth.
*. 1984– Aboard the Space Shuttle Challenger, astronaut Kathryn D. Sullivan becomes the first American woman to perform a space walk.
*.1984 – An Aeroflot Tupolev Tu-154 crashes into maintenance vehicles upon landing in Omsk, Russia, killing 178.
*. 1986– Cold War: U.S. President Ronald Reagan and Soviet leader Mikhail Gorbachev meet in Reykjavík, Iceland, in an effort to continue discussions about scaling back their intermediate missile arsenals in Europe.
*. 1987– Start of Operation Pawan by Indian Peace Keeping Forcein Sri Lanka that killed thousands of ethnic Tamil civilians and hundreds of Tamil Tigers & Indian Army soldiers.
*. 1996– Pala accident: a wood lorry and school bus collide in Jõgeva county, Estonia, killing eight children.
*. 2002– A bomb attack in a shopping mall in Vantaa, Finland kills seven