Caroline Herschel became the first woman to discover a comet on this day in 1786. There's a longer look at her life in the June 30, 2014, episode of Stuff You Missed in History Class, "Caroline Herschel."

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Ferdinand and Isabella issued the Alhambra Decree on this day in 1492.

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The Diggers' Republic of Klipdrift was founded in South Africa on this day in 1870.

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Confederate spy Belle Boyd was arrested on this day in 1862.

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Peru declared independence from Spain on this day in 1821.

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The Korean Armistice Agreement was signed on this day in 1953, ending active hostilities in the Korean War.

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Liberia declared independence on this day in 1847.

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The U.S. invaded Puerto Rico on this day in 1898, during the Spanish-American War.

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The Eastland Disaster occurred in Chicago on this day in 1915.

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The Egyptian Revolution took place on this day in 1952.

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