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What was the period of expansion between 1842 and 1853 so significant to the development of the United States?

User Nrz
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Answer:

After the territorial acquisitions of the 1840s, the idea of additional territorial expansion remained popular with the U.S. public, as did the idea of spreading republican government. Many pro-slavery Southerners sought to expand southwards, allowing for more territory where slavery could continue to grow and expand.

User Ben De La Haye
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