Vulcanism - if you are thinking of the same thing as me then they are all mostly extinct volcanoes although some remain active or dormant.
The major mountain ranges along the Pacific coastline of North America include the Coast Ranges in California, the Cascade Range from British Columbia to Northern California, and the Sierra Nevada in California. Further south in Mexico, the Sierra Madre Occidental and Sierra Madre Oriental run parallel to the Pacific coast.
The Pacific Ranges lie between the Rockies and the Pacific Coast. The Pacific Ranges are located completely within British Columbia Canada.
The Three mountain ranges are: -Cascades -Alaska and Aleutian Ranges -Coast Ranges - On the coastline of the Pacific is the Sierra Nevada of California
The Three mountain ranges are: -Cascades -Alaska and Aleutian Ranges -Coast Ranges - On the coastline of the Pacific is the Sierra Nevada of California
Some of the mountain ranges in the Pacific coast region of North America include the Cascade Range, the Coast Mountains, the Sierra Nevada, and the Coast Range. These ranges run along the western edge of the continent and contribute to the diverse landscapes of the region.
The Pacific Coast Ranges skirt the Pacific shore of Canada..
Cascades, Sierra Nevadas, and Coast Ranges.
Most of the large mountain ranges formed as a result of continental drift/collision, some of the smaller ranges were formed in other ways.
pacific
According to Wikipedia (refer to the link, below), "The Pacific Ranges [an area encompassing the coasts of Canada and the U.S. States of Washington, Oregon, and California] are part of the southern portion of the Coast Plutonic Complex and has been characterized by rapid rates of uplift over the past 4 million years, which has led to relatively high rates oferosion."
Alps
Coastal ranges are typically formed through the collision of tectonic plates, where one plate is pushed beneath the other in a process known as subduction. This movement creates compression and uplift, leading to the formation of mountain ranges nearest to the coast. Erosion by water and other natural forces over millions of years further shape the coastal ranges into their current forms.