April 4
April 4 is the 94th day of the year (95th in leap years) in the Gregorian calendar, with 271 days remaining until the end of the year.[1]Significant events associated with this date include the signing of the North Atlantic Treaty on April 4, 1949, by twelve nations in Washington, D.C., which established the North Atlantic Treaty Organization (NATO) as a collective defense alliance amid rising Cold War tensions.[2][3] On April 4, 1968, civil rights leader Martin Luther King Jr. was assassinated by gunshot while standing on the balcony of the Lorraine Motel in Memphis, Tennessee, an event that sparked widespread riots across the United States.[4] Additionally, April 4 marks the death of U.S. President William Henry Harrison in 1841 after just 31 days in office, the shortest tenure of any American president, attributed to pneumonia contracted during his inauguration.[5] In the realm of technological innovation, Microsoft Corporation was founded on April 4, 1975, by Bill Gates and Paul Allen in Albuquerque, New Mexico, initially to develop and sell BASIC interpreters for the Altair 8800 microcomputer.[6][7] These occurrences highlight April 4's recurrence in pivotal moments of military, social, political, and economic history.