On this day in 1950, China sent troops into Tibet.
On this day in 1954, US President Dwight D. Eisenhower signed into law the Communist Control Act, outlawing the Communist Party.
On this day in 1981, a Manhattan Supreme Court judge jailed Mark David Chapman for 20 years to life for shooting dead John Lennon the previous December.
On this day in 1991, Ukraine declared independence from Moscow.
And on this day in 2006, astronomers at an International Astronomical Union meeting in Prague, Czech Republic, declared that Pluto is no longer a planet.