What was the biggest factor in santa annas army defeating the texan defenders

He had 4,000 troops with him.

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One of the greatest helps to the Texan cause was Santa Anna, the Mexican. So in May 1834, the army and clergy persuaded Santa Anna to dissolve both. The way in which the Alamo was defeated raised the defenders to legendary status.

Explanation:

i confess that there are several parts of this constitution which i do not at present approve, but i am not sure i shall never approve them: for having lived long, i have experienced many instances of being obliged by better information or fuller consideration, to change opinions even on important subjects, which i once thought right, but found to be otherwise. it is therefore that the older i grow, the more apt i am to doubt my own judgment, and to pay more respect to the judgment of others.

the tariff was created to protect industry in the northern part of the united states. industries in the north were being driven out of business by imported goods that were priced at a low rate. the goal was to protect these industries   by taxing the goods.