Antidisestablishmentarianism is a political philosophy that is opposed to the separation of church and state. The term originated in the context of the nineteenth century Church of England, where "antidisestablishmentarians" were opposed to proposals to remove its status as the state church of England. Antidisestablishmentarianism succeeded in England, but failed in Ireland and Wales, with the Church of Ireland being disestablished in 1871 and the Church in Wales in 1920.
It was not required in the United States as a movement or sentiment, as the nation was founded on the principle that no religion should be established by the State. The closest we have come to antidisestablishmentarianism in recent history is the right-wing Christian extremism supported by George Bush, and this sentiment would properly be labeled a form of covert and somewhat corrosive establishmentarianism.