100% verified The same day, three eras.
12 December
Contemporary era
1915
Yuan Shikai proclaims himself Emperor
On 12 December 1915, Yuan Shikai proclaimed himself Emperor of China in a short-lived attempt.
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- Encyclopaedia Yuan Shikai (Wikipedia) Wikipedia. 4/5
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Contemporary era
1901
First transatlantic radio signal
On 12 December 1901, Marconi received the first radio signal sent across the Atlantic.
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- Encyclopaedia Guglielmo Marconi (Wikipedia) Wikipedia. 4/5
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From the Middle Ages to the Enlightenment
1787
Pennsylvania, second state
On 12 December 1787, Pennsylvania became the second state to ratify the US Constitution.
Sources and verification (1)
- Encyclopaedia Pennsylvanie (Wikipedia) Wikipedia. 4/5