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OpenStudy (anonymous):

Which of these factors contributed most to US westward expansion in the second half of the nineteenth century? improved overland trails development of more railroad systems peace treaties with American Indians discovery of gold in Alaska

OpenStudy (anonymous):

@MrDontTalk

OpenStudy (anonymous):

yes?

OpenStudy (anonymous):

B. development of more railroad systems??

OpenStudy (anonymous):

it b

OpenStudy (anonymous):

:)

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