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.
York South
York South was created in 1903 as "the south riding of York" from parts of York East and York West ridings. It initially consisted of the township of York, and the towns of East Toronto, North Toronto, and Toronto Junction. As is suggested by the names of the towns in the riding, the constituency abutted on the city of Toronto's northern border.