Dominion Police
The Dominion Police, although the federal police of Canada, was mainly active in the Eastern Canada region, while the Royal Northwest Mounted Police handled the expansive and sparsely populated Northwest Territories of Western Canada. In May 1918, the 969-member Dominion Police was reassigned under the Department of Militia and Defence and became a civilian wing of the Canadian Military Police Corps (CMPC). In the early 1900s, the Royal Northwest Mounted Police had declined as the Northwest Territories was divided into new provinces and territories, and due to the general unpopularity of the force for conduct during industrial disputes such as the Winnipeg General Strike. On 1 February 1920, the civilian members of the CMPC, including the Dominion Police, were merged with the Royal Northwest Mounted Police to form the Royal Canadian Mounted Police as the new federal police force of Canada, and the CMPC was disbanded on 1 December 1920.
North-West Mounted Police
In 1869, the Canadian Prime Minister, Sir John Macdonald, made plans to create a 200-strong mounted police force to maintain order along the border; such a force, he thought, would enable the colonisation of the region and be much cheaper than deploying regular military units for the task. The implementation of this proposal was delayed, however, first by the rebellion of the Métis, and then by the threat of a Fenian invasion. Meanwhile, a survey conducted in 1871 by Lieutenant William Butler recommended establishing a mounted force of up to 150 men under a magistrate or commissioner, based along the northern trade routes, leaving the border area as a liminal, ungarrisoned zone. Colonel Patrick Robertson-Ross conducted another survey in 1872, and recommended an alternate strategy of recruiting a larger force of 550 men who would be tasked to push south into the border region itself and establish law and order there.