Philadelphia Historic Timeline -
1763: Charles Mason and Jeremiah Dixon begin their survey in Philadelphia for one of the most important boundaries in the U.S.: the Mason-Dixon Line, separating Pennsylvania from Delaware and Maryland, with a starting point at 30 South Street. The Mason-Dixon Line comes to separate the North from the South and the free states from slaveholding states in the 19th century.
In the French and Indian War, England wins French territory east of the Mississippi.
Philadelphia has a post-war building boom. New houses spring up in the city. Wealthy Philadelphians build country estates such as Mount Pleasant, located at 3800 Mount Pleasant Drive in Fairmount Park.
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