Opposition from rival interest groups and the outbreak of the American Revolutionary War (1775–83) prevented the development of Vandalia as a full colony. During the Revolutionary War, some settlers in the region petitioned the American Continental Congress to recognize a new province to be known as Westsylvania, which had approximately the same borders as the earlier Vandalia proposal. As both the states of Virginia and Pennsylvania claimed the region, they blocked recognition of a new state. The Indiana Company presented a bill in equity against the State of Virginia concerning their claims, but the ruling in Chisholm v. Georgia led to the Eleventh Amendment forbidding suits by citizens of another State, and the Supreme Court dismissed the Indiana Company's suit, holding the constitutional amendment applied retroactively.