US western expansion relied upon:

Name: US western expansion relied upon:
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The US western expansion relied upon popular support of the idea of Manifest Destiny, the development of railroads which made transportation and communication easier, aggressive diplomacy that often led to territorial acquisition, and warfare against the Mexican and Amerindian populations in order to secure land and resources. All of these factors played a crucial role in the expansion of the United States to the west.

US Western Expansion Relied Upon