Elvis Presley performed his final performance in Indianapolis, Indiana, US.
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Same-sex marriage became legal in all 50 states.
William IV became king of The United Kingdom and Hanover until his death in 1837.
President Bill Clinton ordered a US cruise missile strike on Iraq.
Dr. Zabdiel Boylston of Harvard University gave the first smallpox inoculations in Boston following America's biggest outbreak.
The emperor of China patented the toothbrush using coarse boar bristles.
