Option a is correct. The railroad most impact the economic growth of Texas because goods were transported inexpensively.
As railroads expanded, farmers were able to transport their products more quickly and inexpensively to markets. As additional railroads were built, Texas' agricultural economy boomed. Despite having less miles of track now, railroads are still a vital form of transportation.
Railroad building in the United States greatly surged starting in the early 1870s. Approximately 45,000 miles of track had been built before 1871. A further 170,000 miles were added to the expanding railroad network of the country between 1871 and 1900. The construction of the transcontinental railroads is responsible for a large portion of the expansion. The Pacific Railway Act, passed by Congress in 1862, gave the go-ahead for the construction of a transcontinental railroad. On May 10, 1869, the first railroad of this type was finished.
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