The Transcontinental Railroad and Westward Expansion Thesis: The transcontinental railroad greatly increased Westward expansion in the United States of America during the latter half of the nineteenth century. The history of the United States has been influenced by England in many ways. In the second half of the 1800's, the railroad, which was invented in England, had a major effect on Western expansion in the United States. "Railroads were born in England, a country with dense populations, short distances between cities, and large financial resources. In America there were different c