Englishman William Penn founded Philadelphia, Pennsylvania.
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The Grand Union Flag flew for the first time with the commissioning of the USS Alfred.
One hundred and forty thousand miners went on strike in Pennsylvania.
Polio vaccines were given to the first group of children in the US at Arsenal Elementary School in Pittsburgh, Pennsylvania.
Blacksmith, Patrick Lyon stole $162,821 in cash and gold from a vault at the Bank of Pennsylvania.
A nuclear disaster occurred at Three Mile Island in Pennsylvania, US.
