July 17:

On this date:

In 1862, during the Civil War, Congress approved the Second Confiscation Act, which declared that all slaves taking refuge behind Union lines were to be set free.

In 1902, Willis Carrier produced a set of designs for what would become the world’s first modern air-conditioning system.

In 1918, Russia’s Czar Nicholas II and his family were executed by the Bolsheviks.

In 1936, the Spanish Civil War began as right-wing army generals launched a coup attempt against the Second Spanish Republic.

In 1944, during World War II, 320 men, two-thirds of them African-Americans, were killed when a pair of ammunition ships exploded at the Port Chicago Naval Magazine in California.

In 1945, following Nazi Germany’s surrender, President Harry S. Truman, Soviet leader Josef Stalin and British Prime Minister Winston S. Churchill began meeting at Potsdam in the final Allied summit of World War II.

In 1955 Disneyland had its opening day in Anaheim, California after its $17 million, year-long construction; the park drew a million visitors in its first 10 weeks.

In 1975, an Apollo spaceship docked with a Soyuz spacecraft in orbit in the first superpower link-up of its kind.

In 1981, 114 people were killed when a pair of suspended walkways above the lobby of the Kansas City Hyatt Regency Hotel collapsed during a tea dance.

In 1996, TWA Flight 800, a Europe-bound Boeing 747, exploded and crashed off Long Island, New York, shortly after departing John F. Kennedy International Airport, killing all 230 people on board.

In 2014, all 298 passengers and crew aboard Malaysia Airlines Flight 17 were killed when the Boeing 777 was shot down over rebel-held eastern Ukraine; both Ukraine’s government and pro-Russian separatists denied responsibility.

In 2020, civil rights icon John Lewis, whose bloody beating by Alabama state troopers in 1965 helped galvanize opposition to racial segregation, and who went on to a long and celebrated career in Congress, died at age 80.

In 2022, a report said nearly 400 law enforcement officials rushed to a mass shooting that left 21 people dead at a Texas elementary school, but “egregiously poor decision-making” resulted in a chaotic scene that lasted more than an hour before the gunman was finally confronted and killed.