USA HISTORY

Detailed explanation-1: -Southerners wanted to annex Texas to the United States because they sought to extend slavery. Northerners opposed annexation because they feared that annexation of more slave territory would tip the uneasy balance of the Senate in favor of slave states—and prompt war with Mexico.

Detailed explanation-2: -Many northerners did not want Texas admitted to the Union as a slave state because it would tip the balance of power in Congress toward the South. Most Southerners wanted Texas to join the Union.

Detailed explanation-3: -Prior to the annexation, many Americans opposed taking Texas into the Union because it was a slave holding state and it would contribute to the growing hostility between slave states and free states. Americans also feared that the annexation of Texas could lead to war with Mexico.