The 1789 vote for the future Capitol of the United States was decided by one vote, between Havre de Grace on the Susquehanna river and a site on the Potomac river. The vote divided the leaders, saying one or the other would represent the nation's future expansions to the west.
However, what if Havre de Grace would have been selected? If a major city had developed on the mouth of the Susquehanna river?