Answer:
After the Battle of Gonzales, he helped organize Texas's provisional government and was selected as the top-ranking official in the Texian Army. ... Houston played a key role in the annexation of Texas by the United States in 1845, and in 1846, he was elected to represent Texas in the United States Senate.
He secured Texan independence and was followed by Houston's election as president (1836–38; 1841–44) of the Republic of Texas. He was influential in gaining the admission of Texas to the United States in 1845.
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