Why did some empresarios choose to disobey the mexican

They lobbied the Mexican government for a reversal of the ban and gained only a one-year extension to settle their affairs and free their bonded workers - the government refused to legalize slavery. The settlers decided to secede from Mexico, initiating the famous and mythologized Battle of the Alamo in 1836.

definitely a for sure. ill see and update if i get the answer

answer; taking up arms to defend the nation;