Upon arriving in Nacogdoches, he was quick to note that Nacogdoches had become an American town and that the chance of American immigrants assimilating to Mexican culture was slim to none. Mier y Teran’s report of the Texas situation prompted the Mexican government to pass the law of April 6, 1830 which intended to stop further immigration into Texas from the United States. The law declared uncompleted empresario agreements void with the exception of the colonies of Austin and DeWitt.
The settlement of Texas by Anglo Americans and other colonists changed the face of Texas with respect to the issue of slavery. In 1829 President Vicente Guerrero issued a directive abolishing slavery throughout the nation. He was concerned about Anglo colonization and believed that depriving the Anglos of their enslaved workforce would discourage Anglos from moving into Texas. A group of people with their own selfish agenda however, were able to get legislation passed that exempt Texas from the Guerrero decree abolishing slavery. This group of people was known as the Viesca