Final answer:
Santa Anna was opposed by Mexican liberals and Texans who revolted against him and the centralists.
Step-by-step explanation:
In the context of the Spanish colonial military, there were several people who did not want Santa Anna to join. One group that opposed Santa Anna was the Mexican liberals who were against his conservative policies and centralization of government. Another group that did not want Santa Anna to join the Spanish colonial military were the Texans who revolted against him and the centralists in Mexico.
1