Answer:
fishing and mining
Step-by-step explanation:
The area surrounding the Spokane falls, was notable as a fishing ground to the the abundant amount of salmon. This made Spokane became a national leader in fishing industry during the early 1900s.
On top of that, many settlers found many reserves of silvers and golds within the Inland Northwest of Spokane. This made a lot of people move to the area to invest in the Spokane's mining industry