The American or Know Nothing Party failed to become the leading opposition party in the 1850s primarily because the

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The American Party/Know Nothing Party was based on anti-immigrant sentiment and nativism, but it also had supporters in both the North and the South. However, as the slavery issue became more divisive in American politics, the American Party's position on immigration was not enough to keep it unified, and it ultimately failed to become the leading opposition party.

The American or Know Nothing Party Failed to Become the Leading