The first music store in America was opened in Philadelphia by Michael Hillegas.
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American driller Edwin Laurentine Drake successfully drilled the first oil well in Pennsylvania, US.
America's second president John Adams was inaugurated in Philadelphia, Pennsylvania.
The first Continental Congress meeting was held in Philadelphia, US.
The Portage Railroad Line in Pennsylvania built the first railroad tunnel in the US.
A nuclear disaster occurred at Three Mile Island in Pennsylvania, US.
