Jonathan Carver served as a member of Rogers’ Rangers and as a Captain in a Massachusetts regiment during the French and Indian War, and also studied surveying and mapping. In the 1760s he wanted to explore the new territory acquired by the British in that war, finally finding a sponsor in Robert Rogers, who had recently been appointed commander at Fort Michilimackinac. The Carver expedition’s objective would be to find a northwest passage to the Pacific Ocean.

Carver departed Fort Michilimackinac in 1766 for Green Bay, where he resupplied and headed west. The expedition explored the upper Mississippi and parts of Minnesota and Iowa before returning to Fort Michilimackinac in August 1767, where Carver found that his sponsor, Major Rogers, had been arrested for treason. Part of this book was probably written at Fort Michilimackinac that winter.

See the Wikipedia entry on Jonathan Carver for more about his later personal story, which is not in Carver’s book, and later claims by historians that parts of this book were plagiarized.