How did the idea of Manifest Destiny influence U.S. expansion in the 1840s?

• A. It restricted settlement to existing states.
• B. It called for immediate demilitarization of new territories.
• C. It supported American territorial expansion across the continent through settlement and conflict.
• D. It emphasized isolationist policy excluding expansion.

Answer: (C)

Manifest Destiny was the belief that the United States was destined to expand across the North American continent, spreading its democracy and institutions. In the 1840s this idea pushed people to move west and led leaders to pursue new lands beyond existing borders. It helped justify the annexation of Texas, the push for Oregon, and, through the Mexican-American War, the vast acquisitions in the Mexican Cession. The expansion happened through both settling new lands and, when needed, using military action to claim territory. That’s why the best description is that this belief supported American territorial expansion across the continent through settlement and conflict. It didn’t call for restricting settlement, demilitarizing new territories, or isolating the country; instead, it encouraged expanding borders to spread American influence.