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 | 
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