Which city had the largest population as a result of the growth of railroads between 1870-1900? *
A.)Houston
B.)Dallas
C.)Forth Worth
D.)San Antonio

the answer is B, dallas

Explanation:

Before the end of 1856 the city of Houston completed its seven-mile line, ... There had already been a merger between the Houston Tap and the ... from Denison through Fort Worth, Austin, San Antonio, and Cuero. ... The largest company was the Texas Electric Railway, with 226 miles centered at Dallas.

nothing certain is known about what happened, but it seems that the country declined gradually, perhaps due to bad government, or, more likely, due to a series of bad harvests, which resulted in widespread and recurrent famine.