As Texas was defending its claim to be a new and independent republic in 1836, a final crucial victory was won at

A. Las Cruces.
B. Goliad.
C. San Antonio.
D. San Jacinto.

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San Antonio

The correct answer is D. San Jacinto. The Battle of San Jacinto, which took place on April 21, 1836, was a decisive battle in the Texas Revolution. It was fought near the present-day city of Houston. In this battle, Texian (Texan) forces led by General Sam Houston defeated the Mexican army led by General Antonio López de Santa Anna. The victory at San Jacinto secured Texas' independence from Mexico.