USA HISTORY

Detailed explanation-1: -Politics in the United States fractured over the issue of whether Texas should be admitted as a slave or free state. In the end, Texas was admitted to the United States a slave state. The annexation of Texas contributed to the coming of the Mexican-American War (1846-1848).

Detailed explanation-2: -Constitutional scruples and fear of war with Mexico were the reasons given for the rejection, but antislavery sentiment in the United States undoubtedly influenced Van Buren and continued to be the chief obstacle to annexation.

Detailed explanation-3: -Opposition began in the early 1820s and crystallized into a movement led by Conscience Whigs and abolitionists between 1836 and 1844. During these years, opponents of annexation fervently warned that acquiring Texas would ignite war with Mexico and set the nation on a path of empire building.

Detailed explanation-4: -Secondly, the annexation of Texas would breach the 1819 treaty with Mexico. And most importantly, northern states and anti-slavery advocates objected strongly, warning that the annexation could lead to civil war. Opposition to annexation in the North was so overwhelming that the measure had no chance of passing.