Early in Canadian history, both the federal and provincial levels used gerrymandering to try to maximize partisan power. When Alberta and Saskatchewan were admitted to Confederation in 1905, their original district boundaries were set forth in the respective Alberta and Saskatchewan Acts. Federal Liberal cabinet members devised the boundaries to ensure the election of provincial Liberal governments. British Columbia used a combination of single-member and dual-member constituencies to solidify the power of the centre-right British Columbia Social Credit Party until 1991.