This Day in History: July 30

britannica.com

Otto von Bismarck

1898 – Death of Otto von Bismarck Otto von Bismarck—who, as prime minister of Prussia (1862–73, 1873–90), used ruthlessness and moderation to unify Germany, founding the German Empire (1871) and serving as its first chancellor (1871–90)—died this day in 1898.

United States

1956 – The phrase “In God we trust” legally became the national motto of the United States.

Charles H. Best and Frederick Banting

1921 – Insulin was first isolated as a pancreatic extract by the Canadian scientists Sir Frederick G. Banting and Charles H. Best.

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