While the First Amendment to the Constitution famously forbids Congress to make any law regarding establishments of religion, the Tenth Amendment delegates all other rights not explicitly forbidden the states to them. As such, it seems to me that any of the individual American states could have legally established some church, particularly in the early days when the understanding of the constitution was more plastic than it is now.
What sequence of events after the ratification of the US Constitution are needed to reach that point, and what Church-State combination is most likely to do so? What impact would that have on American jurisprudence and development? Would an amendment be passed at some point to outlaw that practice?