Westward Expansion 值,、2A In a span of five years, the US increased its size by a third The Us annexed Texas in 1845 The US negotiated with Britain for half of the Oregon country, acquired California, Nevada, Utah, and parts of Arizona, Colorado, New Mexico, and Wyoming as a result of the war with Mexico Tension was building in America over the issue of whether slavery would be allowed in the western territories. This issue was beginning to divide the North and South The Compromise of 1820 solved this issue for about 30 years by drawing a dividing line across the Louisiana Purchase that prohibited slavery north of the line, but permitted slavery south of it The Compromise of 1850 attempted to solve the problem by admitting California as a free state but allowing slavery in the rest of the Mexican cession The Supreme Court's decision in the Dred Scott Case intensified the problem by declaring that Congress could not exclude slavery from the western territoriesWestward Expansion ◼ In a span of five years, the US increased its size by a third. ◼ The US annexed Texas in 1845 ◼ The US negotiated with Britain for half of the Oregon country, acquired California, Nevada, Utah, and parts of Arizona, Colorado, New Mexico, and Wyoming as a result of the war with Mexico. ◼ Tension was building in America over the issue of whether slavery would be allowed in the western territories. This issue was beginning to divide the North and South. ◼ The Compromise of 1820 solved this issue for about 30 years by drawing a dividing line across the Louisiana Purchase that prohibited slavery north of the line, but permitted slavery south of it. ◼ The Compromise of 1850 attempted to solve the problem by admitting California as a free state but allowing slavery in the rest of the Mexican cession. ◼ The Supreme Court’s decision in the Dred Scott Case intensified the problem by declaring that Congress could not exclude slavery from the western territories