Linstructure.com/courses/263351 4. The growth of railroads during the nineteenth century affected U.S. businesses
by-
A. Discouraging Congress from instituting tariffs
B. Increasing the cost of raw materials
C. Decreasing the wages of unskilled workers
D. Opening new Markets for goods

D

Explanation:

D

Explanation:

An extended marketplace provided a greater number of individuals the opportunity to produce and sell goods.

Rich volcanic soil makes the Po and Tiber river valleys ideally suited for agriculture. Historian Mike Anderson notes that volcanic ash made the soil near Rome some of the best in all of Europe. The surplus also helped Rome to establish trade ties with other Mediterranean powers, enhancing the city's economic might.