Westward expansion did indeed have negative consequences for the development of democracy in the United States.
It should be borne in mind that America was a young nation at that time, which was still in a process of national organization and, therefore, did not have fully consolidated political structures.
Even so, the westward expansion fueled the conflict between slaveholders and abolitionists, generating different agreements such as the Compromise of 1820 or the Compromise of 1850 that altered to a greater or lesser extent the organization and structure of national democracy.
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