Why did the number of settlers to the pacific northwest increase dramatically after 1880?

The completion of the transcontinental railroads.

Explanation:

One of the main reasons why the number of settlers to the Pacific Northwest increased dramatically after 1880 was the fact that the transcontinental railroads were completed around this date. The fact that the railroad was completed allowed people to move to the West more easily. It also allowed for the growth of cities and the establishment of new industries and businesses, which in turned attracted even more workers to the region.

your answer would be (a)

alliances in ww1 were different from ww2 because the entente in ww1 made up of serbia,russia,france,britan,japan and italy later america  and all allied in a sort of balance of power and too keep germany,austria-hungary,and the ottomans down. russia allied the serbians in order to exert its influence in the balkans while france allied the russians because france was still in dismay and insulted after the defeat to the germans during the unification of germany and britian allied the belgians after the germans invasion of belgium.in ww2 the alliances were in a preemptive attempt to deter any further wars into happening while germany and italy allied since they were insulted and humiliated after the previous war while also sharing a similar ideology of facsim along with japan which all 3 had a want for world domination and agreed to assist one another in the endevours 

explanation: