Pennsylvania became the second state to ratify the US constitution.
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The deepest point of land was identified.
The first case of the bubonic plague was announced in Honolulu.
The Empire of China was established by statesman Yuan Shikai, who declared himself Emperor.
Adolf Hitler declared the imminent extermination of the Jews at a meeting in the Reich Chancellery.
King Carloman II of West Francia was mortally wounded while out hunting.
