What role did Antonio López de Santa Anna play in the Mexican-American War?

In 1833 Santa Anna was overwhelmingly elected President of Mexico.

Explanation:

He fought for a time for the Spanish against Mexican independence, but along with many other army officers switched sides in 1821 to help install Augustin de Iturbide as head of state of an independent Mexico.

He was the ruler of Mexico. He was the leader of the American forces in Texas. He was the commander of the Mexican military. He was the Mexican ambassador to the United States.

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