In 1701 French explorer and army officer Antoine de la Mothe Cadillac founded Le Fort Ponchartrain du Détroit or "Fort Ponchartrain on-the-Strait" on the strait between Lakes St Clair and Erie, known as the Detroit River. Cadillac had convinced King Louis XIV's chief minister, Louis Phélypeaux, Comte de Pontchartrain, that a permanent community there would strengthen French control over the upper Great Lakes and repel British aspirations.

The hundred soldiers and workers who accompanied Cadillac built a fort enclosing one arpent (about .85 acre, the equivalent of just under 200 feet (61 m) per side) and named it Fort Pontchartrain. Cadillac's wife, Marie Thérèse, soon moved to Detroit, becoming one of the first white women to settle in the Michigan wilderness. The town quickly became a major fur-trading and shipping post. The "Église de Saint-Anne" (Church of Saint Ann) was founded the same year. While the original building does not survive, the congregation of that name continues to be active today.

At the same time, the French strengthened Fort Michilimackinac at the Straits of Mackinac to better control their lucrative fur-trading empire. By the mid-eighteenth century, the French also occupied forts at present-day Niles and Sault Ste. Marie, though most of the rest of the region remained unsettled by Europeans.

From 1660 to the end of French rule, Michigan was part of the Royal Province of New France. In 1759, following the Battle of the Plains of Abraham, in the French and Indian War (1754–1763), Québec City fell to British forces. Under the 1763 Treaty of Paris, Michigan and the rest of New France passed to Great Britain.

During the American Revolutionary War, Detroit was an important British supply center, but most of the inhabitants were either Native Americans or French-Canadians. Because of imprecise cartography and unclear language defining the boundaries in the 1763 Treaty of Paris, the British retained control of Detroit and Michigan. When Quebec was split into Lower and Upper Canada in 1790, Michigan was part of Kent County, Upper Canada. It held its first democratic elections in August 1792 to send delegates to the new provincial parliament at Newark (now Niagara-on-the-Lake).

Under terms negotiated in the 1794 Jay Treaty, Britain withdrew from Detroit and Michilimackinac in 1796. Questions remained over the boundary for many years, and the United States did not have uncontested control of the Upper Peninsula and Drummond Island until 1818 and 1847, respectively.

19th century

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