The following important events affected political boundaries, record keeping, and family movements in Ontario.
1784: After the American Revolution large numbers of Loyalists arrived in newly-surveyed townships along the St. Lawrence River in upper Quebec.
1788: Present southern Ontario was divided into four districts: Hesse, Lunenburg, Mecklenburg, and Nassau.
1791: The old Province of Quebec was discontinued and divided into two separate colonies, Lower Canada (now Quebec) and Upper Canada (now Ontario).
1792: The first parliament began. The four original district names were changed: Hesse to Western, Lunenburg to Eastern, Mecklenburg to Midland, Nassau to Home.
1800: Districts were adjusted to include counties established for the purpose of levying militia and as voting precincts and land registration units. Other municipal functions such as probate registration remained with the districts.
1812: At the time war broke out with the United States, two-thirds of the population were non-Loyalists who had been attracted by the offer of free land.
1815: Many immigrants arrived from Scotland. A large number settled in Lanark County.
1820-1850: Many immigrants arrived from Great Britain and Ireland. About 66,000 British immigrants arrived in 1833, some through the port of New York by way of the Eric Canal. In 1847, famine in Ireland caused thousands of immigrants to come.
1841: The Act of Union established a single combined legislature for Lower Canada (to be called Canada East [Quebec]) and for Upper Canada (called Canada West [Ontario]).
1849: In Canada West (southern Ontario), the counties became functioning governmental units when the old districts were abolished. However, townships within counties remain the basic building block of local government in Ontario until after 1954.
1857: Ottawa became the capital of the Province of Canada.
1867: The Province of Ontario was formed from Canada West and joined the Confederation when the Dominion of Canada was created, uniting Ontario, Quebec, Nova Scotia, and New Brunswick.
1912: Provincial boundaries were moved northward to Hudson Bay.
1954: The Municipality of Metropolitan Toronto was created from the southern half of York County, Ontario.
1967: Many additional counties, townships, and other local governments began to be abolished in Ontario as various large "regional municipalities" and other metropolitan governments were created.
A detailed history of Ontario is:
Middleton, Jesse Edgar. The Province of Ontario: A History, 1615-1927. Five Volumes. Toronto, Ontario: Dominion Publishing Company, 1927-1928. (Family History Library book 971.3 H2mj; Volumes 1, 2, 5 on microfiche 6048255-57; Volumes 3, 4 on 1320801 items 5-6.) Volumes 3-5 are biographical.
Bibliographies of local histories for Ontario are:
Aitken, Barbara B. Local Histories of Ontario Municipalities, 1951-1977. Toronto, Ontario: Ontario Library Assoc., 1978. (Family History Library book 971.3 A1 no. 86.)
Aitken, Barbara B. Local Histories of Ontario Municipalities, 1977-1987. Toronto, Ontario: Ontario Library Assoc., 1989. (Family History Library book 971.3 H23a; not on microfilm.)