Final answer:
Seattle, Tacoma, and Spokane were the Washington cities that grew as immigration increased in the early 1900s.
Step-by-step explanation:
In the early 1900s, as immigration increased, several cities in Washington State experienced growth. Three cities that grew as a result of increased immigration were Seattle, Tacoma, and Spokane.
Learn more about effects of increased immigration in Washington State in the early 1900s