The Legislative Assembly has existed since 1867 when the British North America Act, 1867 severed the Province of Canada into two new provinces, with the portion then called Canada West becoming Ontario. Section 69 of the British North America Act section 69 stipulates "There shall be a Legislature for Ontario consisting of the Lieutenant-Governor and of One House, styled the Legislative Assembly of Ontario". The Legislative Assembly is unicameral, without an upper house, with 107 seats representing electoral districts ("ridings") elected through a first-past-the-post electoral system across the province.