Abolitionists  -  Activists in favor of abolishing slavery

Daniel Webster  -  Daniel Webster (1792-1852) was a well-known American orator, lawyer and politician. As a U.S. Senator, he was an eloquent defender of a strong national government. He opposed the war with Mexico and was instrumental in passing the Compromise of 1850 on slavery, for which many Northerners denounced him. He also served as Secretary of State for Presidents William Henry Harrison, John Tyler and Millard Fillmore.

Mexican-American War  -  The Mexican-American War (1846-1848) was fought over boundary disputes between the two countries; the Americans believed that it was their "Manifest Destiny" to expand their territory. During the war, U.S. forces invaded Mexico and occupied its capital, eventually gaining the land that would later constitute California, Nevada, Utah, most of Arizona and New Mexico, and parts of Colorado and Wyoming.

Transcendentalism  -  A philosophy that became influential in the late 18th century and 19th century. Transcendentalism rejects the idea that knowledge can be fully derived from experience and observation; rather, truth resides in the spiritual world. American transcendentalism reached its peak in New England in the 1840s, under the leadership of Ralph Waldo Emerson. Emerson argued that, while the physical world is important, providing us with necessary goods and frequent beauty, people should live their lives based on truths grasped through reason, not physical perception. People will find truth within themselves; therefore, self-reliance and individuality are critical. Emerson served as a mentor to Thoreau, who became another leading American transcendentalist.