1642 Georgeana (York) in Maine becomes the 1st incorporated American city 1780 Pennsylvania becomes 1st US state to abolish slavery (for newborns only) 1847 Michigan becomes 1st English-speaking jurisdiction to abolish the death penalty (except for treason against the state) 1869 US Postage stamps showing scenes issued for 1st time. These pictorials showed a post horse and rider, a locomotive, a shield, an eagle and a ship, the Adriatic. 1872 Yellowstone becomes the world's 1st national park 1954 US explodes Castle Bravo, a 15 megaton hydrogen bomb at Bikini Atoll, which accidentally became the most powerful nuclear device ever detonated by the US | 
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