Before the northern part of the Rocky Mountain Region was part of Canada, the territory was controlled by who

British.

Explanation:

The British, during the colonial period, spread across Northern America. The purpose of the British empire was to expand its hold in the region for several purposes, including economic reason. They claimed territories and building the British Empire. The northern part of the Rocky Mountain Region was under the British Columbia.  British Columbia added to the British empire during the 19th century as the fur trading began to flourish. Today, The Northern Rockies mountains stretch from the Canadian border to south of Idaho.

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explanation:

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