The southern leaders hoped to gain a territory that could be turned into slave states by making the Texas Territory part of the United States.
After the approval of the Treaty of Guadalupe Hidalgo in 1848, people in the South started wondering about introducing slavery in states like California, New Mexico, and Texas. While the northerners disagreed, southerners were quite adamant as they were interested in the social, political, and economic results of the proposed institution. There was no humanitarian concern associated with this desire.
It was, henceforth, as a result of this desire that southern leaders hoped to gain territory in the Texas Territory by making it a part of the states. It had the potential to be turned into a slave state.
Learn to know more about slavery on
https://brainly.com/question/9331183?referrer=searchResults
#SPJ4