The Pacific Northwest was referred to as the "final frontier" because it was one of the last regions in the continental United States to be explored and settled by Europeans. The rugged terrain, dense forests, and harsh climate of the Pacific Northwest made it a challenging environment for settlers to navigate and establish communities. In the late 19th and early 20th centuries, as the rest of the American West was being rapidly developed and settled, the Pacific Northwest remained relatively untouched and undeveloped, leading to its designation as the "final frontier."
