Amalgamation of Toronto
Forest Hill and Swansea were annexed by the City of Toronto, Leaside was merged with the township of East York to become the Borough of East York. Weston was combined with the Township of York to form the Borough of York. The Village of Long Branch and the towns of Mimico and New Toronto merged with the township of Etobicoke to form the Borough of Etobicoke. North York township was promoted to the Borough of North York. Scarborough was also transformed into a borough.Amalgamation occurred in 1998 when the regional municipality of Metropolitan Toronto and its six constituent municipalities – East York, Etobicoke, North York, Scarborough, York, and the City of Toronto (1834) were dissolved by an act of the Government of Ontario. A new single municipality called the City of Toronto (colloquially dubbed the "megacity") was formed, replacing all seven governments. The expanded city became the fifth most populous municipality in North America, behind Mexico City, New York City, Los Angeles and Chicago; it later surpassed Chicago in population.
North York City Centre
The post-World War II period saw the rapid growth of the suburbs of Toronto. To accommodate the growth, the area was amalgamated into Borough of North York and Metropolitan Toronto in the 1950s. The large expansion of Ontario Highway 401, known as the Toronto Bypass, just to the south connected the district further by highway. The area was filled in by the 1960s with residential single-family subdivisions. By the 1960s, some high rise development was occurring, such as a Canadian Government Building at Yonge and Elmhurst Street and the twin-tower Sheppard Centre commercial and office complex at Yonge and Sheppard. The 1970s saw the extension of the Yonge–University line to Finch, connecting the area to downtown Toronto.