People in the South wanted to annex Texas to the United States because they feared Texas would join Britain and declare an end to slavery.
The Southern States intended to annex Texas because they thought it would become a slave state and give the slave states more sway in the Senate if it joined the Union.
In an effort to aid in the defense of the region against Indian attacks, the Mexican government urged the Texans to settle in Texas. In exchange, the Texans pledged their allegiance to the Mexican government and its laws. Slavery was forbidden in Mexican regions, according to one of the statutes.
The Texans' disobedience to the anti-slavery laws of Mexico contributed to their civil war with the Mexican government. As a result of their victory over Mexico, the Texans proclaimed their independence.
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