Hoping to build a buffer between the Comanche and the settled areas of Mexico, the Mexican government allowed Americans to emigrate to remote and empty Texas. The native population was soon outnumbered by the immigrants, many of whom were from the southern states, so they wanted to continue their practice of slavery even though it was illegal in Mexico. Rapid immigration and the colonists’ growing dissatisfaction with their status as Mexican citizens meant that conflict was inevitable. After a series of confrontations, open warfare began in October 1835 and the rebels had gained control of Texas by early December.
Here is Part I of my podcast on the Texan Revolution, it is 32 minutes long.