The correct answer would be;
Texas was part of the Mexican frontier, and settlers faced frequent raids by native tribes. Bankrupt and unable to provide much military assistance, in 1824 the federal government legalized immigration from the United States and Europe, hoping that an influx of settlers would discourage raiding. As the number of Americans living in Texas increased, Mexican authorities became apprehensive that the United States intended to annex the area, possibly by force. To curb the perceived threat, the Mexican government passed the Law of April 6, 1830, which restricted immigration from the United States into Texas and called for the first enforcement of customs duties. The new laws were unpopular with both native Mexicans in Texas (Tejanos) and recent immigrants (Texians).
