People who believed in Manifest Destiny were known as... Expansionists
This is because they wanted to expand the boundaries of the U.S.
expansionists ;
People who believed in Manifest Destiny were known as Expansionists, who thought it was the destiny of the United States to expand its territory across North America. This belief justified actions like the annexation of Texas and led to the U.S.-Mexican War. While it promoted the idea of spreading democracy, it also resulted in significant negative impacts on Native American and Mexican populations.
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