The political rivalry between Calgary and Edmonton cooled even further after the 1921 general election, in which Conservative support collapsed throughout the province including Calgary, and in which the Liberals were swept from power by the rural-based United Farmers of Alberta. For the next fifty years, provincial politics was split more or less on an urban-rural basis, with rural voters consistently and overwhelmingly supporting UFA and then Social Credit governments while the Conservatives and Liberals made intermittent efforts at electoral co-operation in an attempt to maintain a foothold at least in the two major cities.