Why was the Pacfic Northwest referred to as the "final frontier"?

The Pacific Northwest was referred to as the "final frontier" because it was one of the last regions in the United States to be explored and settled by European Americans. The rugged terrain, dense forests, and harsh weather conditions made it a challenging and often perilous place to navigate and establish permanent settlements. Additionally, the indigenous peoples of the region, such as the Native American tribes, presented a significant obstacle to early settlers looking to expand into the area. The term "final frontier" evokes a sense of adventure, exploration, and untamed wilderness, capturing the essence of the Pacific Northwest as a remote and uncharted territory waiting to be conquered and colonized.