History of Toronto
In 1998, the six municipalities comprising Metropolitan Toronto – East York, Etobicoke, North York, Scarborough, York, and the old City of Toronto – and its regional government were amalgamated into a single City of Toronto (colloquially dubbed the "megacity") by an act of the Government of Ontario. This was despite a municipal referendum in 1997 that was overwhelmingly against amalgamation. Subsequently, Mel Lastman defeated Barbara Hall to become the first elected mayor of the megacity.
Metropolitan Toronto
Prior to the formation of Metropolitan Toronto, the municipalities surrounding the central city of Toronto were all independent townships, towns and villages within York County. After 1912, the city no longer annexed suburbs from York Township. At times, the suburbs asked to be annexed into Toronto, but the city chose not to do so.