Philadelphia could have been way bigger if it remained the US capital (Maybe the south allows it as a comprise for allowing slavery into parts of the Northwest territory like everything south of Wabash river) and made that city the main terminus of European immigration. We could easily see it grow past New York City (especially in the early years not sure later as New York might also still be preferred for immigration for many). But still were dealing with a population likely north of 4 million and a metro of ten million plus and New Jersey would likely turn into pretty much all Urban/Suburban development.
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