The foothills of the Canadian Rockies, as the most easterly portion, were the first to form in response to deformations on the continental margin.

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The Canadian Rockies themselves, not the foothills, were the first to form due to the deformation of the continental margin, as the mountains were pushed up by tectonic forces. The foothills formed later as erosion and sedimentation processes reshaped the landscape around the newly formed mountain ranges.

The Foothills of the Canadian Rockies, as the Most Easterly