On This Day, April 4: 12 nations sign treaty creating NATO

President Bill Clinton dons the red beret of the Red Eagles as he speaks with U.S. Troops stationed as part of a NATO peacekeeping force on January 13, 1996, in Tuzla, Bosnia. On April 4, 1949, representatives of 12 nations gathered in Washington to sign the North Atlantic Treaty, creating the NATO alliance. File Photo by Mike Marucci/UPI
President Bill Clinton dons the red beret of the Red Eagles as he speaks with U.S. Troops stationed as part of a NATO peacekeeping force on January 13, 1996, in Tuzla, Bosnia. On April 4, 1949, representatives of 12 nations gathered in Washington to sign the North Atlantic Treaty, creating the NATO alliance. File Photo by Mike Marucci/UPI
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April 4 (UPI) -- On this date in history:

In 1841, President William Henry Harrison died of pneumonia after serving one month in office. He was the ninth President of the United States, and the first to die in office. He was succeeded by Vice President John Tyler, the first person to occupy the office without being elected to it.

In 1850, the city of Los Angeles was incorporated.

In 1887, Susanna Madora Salter was elected as the first female mayor in the United States -- in Argonia, Kan.

In 1933, the USS Akron, a U.S. Navy airship, is destroyed during a major storm off the coast of New Jersey. The tragedy claimed the lives of 73 of the 76 crewmen and passengers.

Roger Ebert appears backstage at the 61st annual Directors Guild of America Awards in Los Angeles on January 31, 2009. On April 4, 2013, the Pulitzer Prize-winning Chicago film critic died after a long battle with cancer. He was 70. File Photo by Jim Ruymen/UPI
Roger Ebert appears backstage at the 61st annual Directors Guild of America Awards in Los Angeles on January 31, 2009. On April 4, 2013, the Pulitzer Prize-winning Chicago film critic died after a long battle with cancer. He was 70. File Photo by Jim Ruymen/UPI

In 1949, representatives of 12 nations gathered in Washington to sign the North Atlantic Treaty, creating the NATO alliance.

In 1968, civil rights leader Martin Luther King, Jr. was assassinated as he stood on the balcony of the Lorraine Motel in Memphis Tenn. He was 39.

An unconscious Syrian child receives treatment at a hospital in Khan Sheikhun, a rebel-held town in the Syrian Idlib province, following a suspected toxic gas attack on April 4, 2017. File Photo by Omar Haj Kadour/UPI
An unconscious Syrian child receives treatment at a hospital in Khan Sheikhun, a rebel-held town in the Syrian Idlib province, following a suspected toxic gas attack on April 4, 2017. File Photo by Omar Haj Kadour/UPI

In 1975, Microsoft was founded by Bill Gates and Paul Allen.

In 1983, the space shuttle Challenger lifted off on its inaugural mission.

On April 4, 1968, civil rights leader Martin Luther King, Jr. was assassinated as he stood on the balcony of the Lorraine Motel in Memphis, Tenn. He was 39. UPI File Photo
On April 4, 1968, civil rights leader Martin Luther King, Jr. was assassinated as he stood on the balcony of the Lorraine Motel in Memphis, Tenn. He was 39. UPI File Photo

In 1991, Sen. John Heinz, R-Pa., and six others were killed in the midair collision of a chartered airplane and a helicopter that was inspecting the plane's landing gear near Philadelphia.

In 2005, the president of Kyrgyzstan, Askar Akayev, officially resigned. He had been driven out by a coup a month earlier.

A Syrian migrant looks out a window of a train heading toward Vienna in the Keleti train station in Budapest, Hungary, on September 6, 2015. On April 4, 2014, the United Nations announced that the millionth refugee from war-torn Syria had entered Lebanon. File Photo by Achilleas Zavallis/UPI
A Syrian migrant looks out a window of a train heading toward Vienna in the Keleti train station in Budapest, Hungary, on September 6, 2015. On April 4, 2014, the United Nations announced that the millionth refugee from war-torn Syria had entered Lebanon. File Photo by Achilleas Zavallis/UPI

In 2013, Pulitzer Prize-winning Chicago film critic Roger Ebert died after a long battle with cancer. He was 70.

File Photo by Jim Ruymen/UPI
File Photo by Jim Ruymen/UPI
People take photos of the Hollywood sign February 23, 2013. On April 4, In 1850, the city of Los Angeles was incorporated. File Photo by Kevin Dietsch/UPI
People take photos of the Hollywood sign February 23, 2013. On April 4, In 1850, the city of Los Angeles was incorporated. File Photo by Kevin Dietsch/UPI

In 2014, the United Nations announced that the millionth refugee from war-torn Syria had entered Lebanon.

In 2017, Syrian government forces kill dozens of civilians in a chemical attack in the rebel-held town of Khan Sheikhoun.

Microsoft Chairman Bill Gates attends the NBA Finals game on June 10, 1996, in Seattle. On April 4, 1975, Microsoft was founded by Gates and Paul Allen. File Photo by Jim Ruymen/UPI
Microsoft Chairman Bill Gates attends the NBA Finals game on June 10, 1996, in Seattle. On April 4, 1975, Microsoft was founded by Gates and Paul Allen. File Photo by Jim Ruymen/UPI

In 2019, the Church of Jesus Christ of Latter-day Saints reversed its policy denying the children of lesbian, gay, bisexual and transgender parents to be blessed as infants and baptized as members.

In 2023, former President Donald Trump pleaded not guilty in a Manhattan court to 34 felony counts related to falsifying records in multiple hush-money schemes, including one involving adult film actor Stormy Daniels. The trial is set for April 2024.

The Space Shuttle Challenger lifts off from Launch Complex 39 at Kennedy Space Center, at 11:38 a.m on January 28,1986. On April 4, 1983, the space shuttle Challenger lifted off on its inaugural mission. UPI File Photo
The Space Shuttle Challenger lifts off from Launch Complex 39 at Kennedy Space Center, at 11:38 a.m on January 28,1986. On April 4, 1983, the space shuttle Challenger lifted off on its inaugural mission. UPI File Photo
File Photo by Louis Lanzano/UPI
File Photo by Louis Lanzano/UPI