Which of these factors contributed most to us westward expansion in the second half of the nineteenth century? . a. improved overland trails. b. development of more railroad systems. c. peace treaties with american indians. d. discovery of gold in alaska.

Development of more railroad systems contributed most to US westward expansion in the second half of the nineteenth century. The correct answer between all the choices given is the second choice or letter B. I am hoping that this answer has satisfied your query and it will be able to help you in your endeavor, and if you would like, feel free to ask another question.

Development of more railroad systems contributed most to US westward expansion in the second half of the nineteenth century. Option B is correct.

Westward expansion, the 19th-century movement of settlers into the American West, started with the Louisiana Purchase and was driven by the Gold Rush, the Oregon Trail and a belief in "manifest destiny."

In 1862, Congress passed the Pacific Railroad Bill and numerous grants that allowed financial support for the Central Pacific and Union Pacific railroad companies. These two companies then constructed the transcontinental railroad.

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i see, would you mind putting it as one?