The Outer Space Treaty was signed to prevent the use of nuclear weapons being utilized in space.
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President Donald Trump banned citizens of seven countries from entering the US.
The Vietnam War officially ended, for the US at least, after the Paris Peace Accords were signed.
The UK Parliament passed the Military Service Act of 1916, introducing conscription in the UK.
Germany first observed the International Holocaust Remembrance Day.
Michael Jackson's hair caught fire while filming a Pepsi commercial in front of 3,000 fans.