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 Carl Linnaeus – the formal start date of plant taxonomy adopted by the International Code of Botanical Nomenclature
1840: “Penny Black”, the world’s first adhesive postage stamp issued by Great Britain
1886: US general strike for 8-hour working day begins
1924: German automobile manufacturers Daimler-Motoren-Gesellschaft and Benz & Cie begin their first joint venture (later merge into Mercedes-Benz)
1931: Empire State Building opens in New York City
Source: Onthisday.com
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