MCAP US History Practice Test

Manifest Destiny was the belief that the United States was destined to expand across the North American continent, and that this expansion was both justified and inevitable. That conviction drove policy and popular action in the 1840s and 1850s, pushing the nation to acquire more territory. The clearest examples are Oregon, gained through negotiations with Britain, and the Mexican Cession, obtained after the Mexican-American War and formalized in the Treaty of Guadalupe Hidalgo in 1848. This push to add land defined the era’s trajectory, creating new fronts for settlement and statehood.

Expansion also intensified debates over whether new territories would permit slavery, helping to heighten sectional tensions and shape political struggle, but the central impulse of Manifest Destiny in this period was the expansion itself, not an end to expansion.