German mathematician Carl Friedrich Gauss constructed the first heptadecagon using a ruler and a compass.
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The US adopted the 15th Amendment, guaranteeing citizens the right to vote.
Someone tried to shoot President Ronald Reagan.
An orbital-class rocket was successfully reused for the first time.
North Carolina repealed its controversial bathroom law that restricted transgender use.
Swimmer Michael Phelps smashed the world record for the 200-meter butterfly swim at just 15 years old.
