Canada became an independent nation by A. Winning a war against Great Britain.
B. Signing a series of treaties with Great Britain.
C. Buying the land from France.
D. Overthrowing Great Britain’s monarchy.

B

Explanation:

On July 1, 1867, with passage of the British North America Act, the Dominion of Canada was officially established as a self-governing entity within the British Empire. ... In 1885, the Canadian Pacific Railway was completed, making mass settlement across the vast territory of Canada possible.