The Government of Ireland Act 1920 attempted to answer the "Irish question" within the United Kingdom of Great Britain and Ireland, by grouping the counties into separate home rule jurisdictions of Northern Ireland and Southern Ireland, with Fermanagh in the former and Monaghan in the latter. Irish republican opposition saw the 1920 act superseded by the 1921 Anglo-Irish Treaty, with Southern Ireland being replaced by a dominion called the Irish Free State and the provisional border with Northern Ireland subject to change by an Irish Boundary Commission. Protestant unionists owned most of the land in Drummully but were a minority of the population. The boundary commission's 1925 report proposed straightening the locality's sinuous border, transferring Drummully ED's northernmost 14% (; population 51) to Northern Ireland, and (population 3,808) of adjoining Fermanagh EDs to the Free State. The Clones–Butlersbridge road, the Ulster Canal, and the railway line between Clones and Redhills would each have been entirely south of the border instead of crossing it four times (the canal forming the border for several hundred yards). However, the report as a whole proved so controversial that it was suppressed and never implemented.