An effect of internal migration on the economy of the American West during the late 19th century was it helped western businesses address labor shortages. Thus the correct answer is B.
What is migration?
Migration is referred to as the movement of people from one place to another to look for better opportunities and facilities for a living to help to achieve the goals of their life.
The effect of migration is result in innovation, as people from different background moves to foreign countries and brings skills and talents along with them which will lead to innovation.
This will helps western businesses to address the problem of labor shortages as most people will look for employment to survive. Organizations can hire them in their business units to fulfill their shortage of manpower.
Therefore option B it helped businesses to address the shortage of labor in western countries will be appropriate.
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