Unit 4: Expansion and Reform (1820-1860)

Answer: B — The correct answer, B, is because the Mexican-American War and the subsequent Treaty of Guadalupe Hidalgo led to a significant increase in U.S. territory, which in turn led to a renewed debate over whether slavery should be allowed to expand into these new territories. This debate ultimately contributed to the tensions leading up to the Civil War. Option A is incorrect because the Treaty of Guadalupe Hidalgo did not address the issue of slavery. Option C is incorrect because the expansion of U.S. territory actually increased tensions between Native American tribes and U.S. settlers as more land was sought for settlement. Option D is incorrect because the secession of southern states did not occur until several years later, in 1861, and was a result of the election of Abraham Lincoln and the failure to find a compromise on the issue of slavery.

Answer: A — The correct answer, A, is the best description of the primary implication of Manifest Destiny. This concept was rooted in the belief that the United States was destined to expand its territory and spread its democratic values across North America. Options B, C, and D are incorrect because they do not accurately reflect the core idea of Manifest Destiny, which was centered on the idea of westward expansion and the spread of American values.

Answer: A — The correct answer, A, reflects the primary idea behind Manifest Destiny, which was the belief that the United States was destined to expand its territory across North America, spreading democracy and civilization. Option B is incorrect because Manifest Destiny was about expansion, not limiting development to existing territory. Option C is incorrect because while the expansion of slavery was a factor in westward expansion, it was not the primary idea behind Manifest Destiny. Option D is incorrect because Manifest Destiny often involved conflicts with Native American tribes, rather than avoiding them.

Answer: C — The Kansas-Nebraska Act is correct because it allowed new states to decide whether to allow slavery, which led to pro-slavery and anti-slavery violence and heightened tensions between the North and South. Option A is incorrect because the secession of Southern states did not occur until after the election of Abraham Lincoln in 1860. Option B is incorrect because the Kansas-Nebraska Act did not result in the abolition of slavery. Option D is incorrect because the Kansas-Nebraska Act actually increased tensions between the North and South, rather than leading to increased cooperation.

Answer: C — The correct answer, C, is the escalation of violent conflict over the issue of slavery. This is because the Kansas-Nebraska Act repealed the Missouri Compromise, which had previously prohibited slavery in the Kansas territory, and allowed the residents to decide for themselves whether to allow slavery. This led to pro-slavery and anti-slavery groups clashing in the territory, resulting in violent conflict. The other options are incorrect because the Kansas-Nebraska Act did not lead to the immediate admission of Kansas as a free state (A), the establishment of a permanent boundary between slave and free territories (B), or the creation of a new federal agency to oversee westward expansion (D).