Final answer:
Juan Cortina was a Tejano ranchero, defender of Mexican Americans' land rights, and leader of the 1859 raid on Brownsville.
Step-by-step explanation:
Juan Cortina was a Tejano ranchero in the Lower Rio Grande Valley. He was also a defender of Mexican American's land rights and a leader of the 1859 raid on Brownsville. However, he was not a Tamaulipas military commander. Therefore, the correct answer is All of the above.
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