Cambridge (2011 population 126,748) is a city located in Southern Ontario at the confluence of the Grand and Speed rivers in the Regional Municipality of Waterloo, Ontario, Canada. It is an amalgamation of the City of Galt, the towns of Preston and Hespeler, and the hamlet of Blair.Galt covers the largest portion of Cambridge, making up the southern half of the city. Preston and Blair are located on the western side of the city, while Hespeler is in the most northeasterly section of Cambridge.Cambridge began as a composite city in 1973, when the City of Galt, Towns of Preston and Hespeler, and the hamlet of Blair were amalgamated.There was considerable resistance among the local population to this "shotgun marriage" arranged by the provincial government and a healthy sense of rivalry had always governed relations among the three communities. Even today, though many residents will tell the outside world that they call Cambridge home, they will often identify themselves to each other as citizens of Galt or Preston or Hespeler. Each unique centre has its own history that is well documented in the Cambridge City Archives.The first mayor of Cambridge was Claudette Millar, who at the time was one of the few female mayors and, at 35, the youngest mayor, in Canada.