2. The United States grew and expanded in the mid-1800s in many ways.

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Explanation:

The westward expansion of slavery was one of the most dynamic economic and social processes going on in this country. The westward expansion carried slavery down into the Southwest, into Mississippi, Alabama, crossing the Mississippi River into Louisiana. ... Without slavery, you could not have civilization, they said.

During this crucial period, the United States pursued a policy of expansion based on “manifest destiny,” the ideology that Americans were in fact destined to extend their nation across the continent. The United States even proved to be willing to go to war to secure new territories.

Expansion (1820-1849) During the early 1800's, settlers moved westward over the Appalachian Mountains into the new states and territories. ... Americans also settled in the Oregon Country, a large territory between California and Alaska claimed by both Britain and the United States.

To Jefferson, westward expansion was the key to the nation's health: He believed that a republic depended on an independent, virtuous citizenry for its survival, and that independence and virtue went hand in hand with land ownership, especially the ownership of small farms.

Factors that contributed to America's westward expansion in the later half of the 19th century included the quelling of Native American resistance and relocation of tribes to reservations, gold rushes (in Colorado, California, and the Black Hills of South Dakota) and the building of the Intercontinental Railroad.Jun 24, 2018

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answer; the president uses mass media to gain support for policies;