Hi, there! :)
During the Cordilleran orogeny, deformation moved westward towards the North American continent.
This period of mountain-building and deformation occurred along the western edge of the North American plate, and lasted from approximately 100 million to 40 million years ago. The Cordilleran orogeny resulted in the formation of the Rocky Mountains and many other mountain ranges in western North America.
Hope that helps! Good luck! ^_^