Answer:
A. It is where labor costs were most reasonable.
Step-by-step explanation:
The Midwestern United States developed dramatically in the 19th century. Along with mechanical improvements that drastically increased the amount of crop per unit area, the amount of land under cultivation increased dramatically over the second half of the 19th century, as in which the creation of a large and efficient rail network and the forced relocation of indigenous to indigenous reserves opened new areas for settlement in the Midwest.
Currently, the Midwest region is quite industrialized, a country called the Manufacturing Belt. The area that corresponds to industrial production and manufacturing, mainly textile, electronics, automotive, has decreased its performance due to the emergence of new industrial nuclei on the west and south coast of the country called Sun Belt (Sun Belt), which has main productive activities the aerospace, military and space industry.