Waterloo is a city in Southern Ontario, Canada. It is the smallest of the three cities in the Regional Municipality of Waterloo, and is adjacent to the city of Kitchener.Kitchener and Waterloo are often jointly referred to as "Kitchener-Waterloo" (K-W), or "the Twin Cities", although they have separate city governments. There have been several attempts to amalgamate the two cities (sometimes with the city of Cambridge as well), but none have been successful. At the time of the 2011 census, Waterloo had a population of 98,780.Waterloo was built on land that was part of a parcel of 675,000 acres (2,730 km²) assigned in 1784 to the Iroquois alliance that made up the League of Six Nations. Almost immediately-and with much controversy-the native groups began to sell some of the land. Between 1796 and 1798, 93,000 acres (380 km²) were sold through a Crown Grant to Richard Beasley, with the Six Nations Indians continuing to hold the mortgage on the lands.The first wave of immigrants to the area was Mennonites from Pennsylvania. They bought deeds to land parcels from Beasley and began moving into the area in 1804. The following year, a group of 26 Mennonites pooled resources to purchase all of the unsold land from Beasley and discharge the mortgage held by the Six Nations Indians.The Mennonites divided the land into smaller lots; two lots initially owned by Abraham Erb became the central core of Waterloo. Erb is often called the founder of Waterloo, as it was his sawmill (1808) and grist mill (1816) that became the focal point of the area.