1678-Venetian Elena Cornaro Piscopia is awarded a doctorate of philosophy from the University of Padua, the first woman to receive a university doctoral degree or PhD
1876-Battle of the Little Bighorn: U.S. 7th Cavalry under Brevet Major General George Armstrong Custer is wiped out by Sioux and Cheyenne warriors led by Chiefs Crazy Horse and Sitting Bull in what becomes famously known as "Custer's Last Stand"
1929-U.S. President Herbert Hoover authorizes building of Boulder Dam (Hoover Dam)
1941-U.S. President Franklin D. Roosevelt signs Executive Order 8802, which forbids racial discrimination in the defense industry
1950-North Korea invades South Korea, beginning the Korean War
2021-WHO head Tedros Adhanom Ghebreyesus confirms the COVID-19 Delta variant is the most transmissible to date, now present in 85 countries and spreading rapidly