Which U.S. leader was instrumental in obtaining Texas independence from Mexico?

Sam Houston played a pivotal role in the Texas independence movement from Mexico, serving as the commander-in-chief of the Texian Army and leading his troops to victory at the Battle of San Jacinto in 1836. This decisive battle was critical in securing Texas’ independence, as it resulted in the capture of Mexican General Santa Anna, who was forced to sign treaties that recognized Texas as an independent republic.

Houston's leadership and military strategy were crucial during the Texas Revolution, and he became a central figure in the early history of Texas. His vision for the region and advocacy for joining the United States further cemented his importance in the context of Texas’ struggle for independence.

While Stephen F. Austin is often recognized as the "Father of Texas" for his early efforts in colonizing Texas and supporting settlers, his contributions were more about settling and diplomacy rather than the direct military action needed to achieve independence. James K. Polk, as President, later facilitated the annexation of Texas into the United States but was not directly involved in securing its independence. Andrew Jackson, although influential in national politics, did not significantly impact the Texas independence fight itself. Thus, Sam Houston stands out as the most instrumental leader in achieving Texas's independence from Mexico.