Banned slavery. That is one of the reasons Texas seceded.
Since Mexico banned slavery. See related questions.
slavery in the territory acquired from Mexico
False. It started when Mexico banned slavery.
Slavery (it was banned in Mexico since 1830).
Mexico banned slavery. This enraged Texian ranchers (already slave owners), who sought to secede from Mexico. This sparked the Texas Revolution (1835-1836) and eventually, the Mexican-American War (1846-1848).
The question of slavery (banned in Mexico, but carried out by Texan ranchers).
They didn't; they just banned slavery in Mexico, which caused stir among Texans (they were slave owners). See related questions.
.....slavery IS banned......
Slavery was banned in the Northwest Territory in 1787.
Slavery was banned by the Constitution in 1865 by the Thirteenth Amendment.
Georgia initially banned slavery because it was a debtor's colony.