1707: Acts of Union comes into force, uniting England and Scotland to form the United Kingdom of Great Britain
1753: Publication of Species Plantarum by Carolus Linnaeus, and the formal start date of plant taxonomy adopted by the International Code of Botanical Nomenclature
1841: First emigrant wagon train leaves Independence, Missouri, for California
1886: US general strike for 8-hour working day begins
1931: Empire State Building opens in New York City
Source: Onthisday.com
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