What event marks the point at which Texas gained independence from Mexico?

The event that signifies Texas gaining independence from Mexico is the Battle of San Jacinto. This decisive battle occurred on April 21, 1836, when Texan forces led by Sam Houston mounted a surprise attack against the Mexican army under President Antonio López de Santa Anna. The victory at San Jacinto resulted in the capture of Santa Anna and ultimately led to the signing of the Treaties of Velasco, which granted Texas its independence.

The other options, while related to the broader context of Texan independence, do not specifically mark the moment of independence. The Battle of the Alamo, for instance, was a significant event symbolizing the struggle for independence but occurred earlier in 1836 and did not directly result in independence. Texas Annexation refers to the process whereby Texas became a state in the United States in 1845, which occurred after Texas had already declared and secured its independence. Therefore, the Battle of San Jacinto is recognized historically as the pivotal event that marked Texas's liberation from Mexico.