Was most responsible for the ethnic diversity that developed in washington during the years of growth?
a.) knights of labor
b.) wobblies
c.) weyerhaeuser timber company
d.) railroad

The correct answer is D) railroad.

The railroad was most responsible for the ethnic diversity that developed in Washington during the years of growth.

Historians considered that one of the most important elements in the development of Seattle, Washington was the construction of railroad lines. The company that built the railroads was the Northern Pacific Railroad. By 1890, the company invested a lot of money in building infrastructures such as stations and services. This served to bring more people to the region and transportation through the railroad helped to increase trade and population.

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explanation:

the group i'm selecting: greeks.

a first group of greek immigrants came to the us in the 1850s. the second group came to america starting in the 1890s due to economic opportunities they didn't have back in their home caused by the hardships of ottoman rule. greek immigration was 90% male, many of them expected to work and return to greece after earning enough capital, but ultimately had to remain in the us after the greek genocide.