Answer:
The doctrine or political position that opposes the withdrawal of state recognition of an established church. Specifically, antidisestablishmentarianism was opposition to the withdrawal of support for the Anglican Church by the English government in the 19th century.
Antidisestablishmentarianism is a political position that originated in 19th-century Britain in opposition to proposals for the disestablishment of the Church of England, that is, to remove the Anglican Church's status as the state church of England, Ireland, and Wales.
The establishment was maintained in England, but in Ireland the Church of Ireland (Anglican) was disestablished in 1871. In Wales, four Church of England dioceses were disestablished in 1920, subsequently becoming the Church in Wales.
The question of disestablishment of the Church of England is still current, often tied with the position of the English monarch as "Supreme Governor" of the Church (see Act of Settlement 1701). Those who wish to continue the establishment of the Church of England are referred to as Antidisestablishmentarians