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.
Milliken, Ontario
In 1954, the area south of Steeles Avenue was severed from York County, forming the Municipality of Metropolitan Toronto. As the community was situated along Steeles Avenue, it was split between the two county/regional governments. The southern portion of the community, Milliken, became a part of Metropolitan Toronto, whereas the northern portion of the community, Milliken Mills, remained with York County (reorganized into the Regional Municipality of York in 1971).