U.S. western expansion relied upon

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All of these factors played a significant role in U.S. western expansion. Manifest Destiny was a widely held belief that American settlers were destined to expand across the continent, which garnered popular support. Railroads were crucial for transportation and economic development. Aggressive diplomacy and warfare against Mexican and Amerindian populations were also part of the expansion process, often resulting in the acquisition of new territories or the removal of indigenous peoples.

U.S. Western Expansion Relied Upon