USA HISTORY

Detailed explanation-1: -The leadership of both major U.S. political parties, the Democrats and the Whigs, opposed the introduction of Texas, a vast slave-holding region, into the volatile political climate of the pro-and anti-slavery sectional controversies in Congress.

Detailed explanation-2: -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-3: -Texas President Mirabeau B. Lamar (1838–41) opposed annexation. He held visions of empire in which Texas would rival the United States for supremacy on the North American continent.

Detailed explanation-4: -The United States didn’t immediately annex Texas because Northerners opposed to slavery objected to the annexation of more slave territory and didn’t want slave states to outnumber free states. Many Americans also feared that annexation would lead to war with Mexico.