What three things did Sam Houston want to accomplish as president?

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Explanation:

Houston served as the republic’s president until 1838, then again from 1841 to 1844. Despite plans for retirement, Houston helped Texas win admission to the United States in 1845 and was elected as one of the state’s first two senators. He served three terms in the Senate and ran successfully for Texas’ governorship in 1859. As the Civil War loomed, Houston argued unsuccessfully against secession, and was deposed from office in March 1861 after refusing to swear allegiance to the Confederacy. He died of pneumonia in 1863.

The statement that best describes the main reason Southerners supported the annexation of Texas would be that "(D) They wanted more territory and land where slavery had been established," since this was during the era when the issue of slavery was decided by "popular sovereignty" in each new state.