Mexico encouraged foreign settlers to buy land in the territory
Because Mexico doesn't allow slavery, they feared they would lose control over the state so they began encouraging more migration from Mexicans into the area.
COME AND TAKE IT
Fearing the possibility of losing control of Texas, Mexico banned further immigration from the United States on April 6, 1830 and encouraged immigration from Mexico and European countries, placed more restrictions on slavery, and increased military presence in the region.
Texans wanted Mexico to allow immigration from the U.S., provide more protection from native peoples, exempt Texans from anti-slavery laws, improve the mail service, and separate Texas from Coahuila. Stephen F. Austin was imprisoned in Mexico City on suspicion of inciting insurrection.
Tension grew between Texas and Mexico. Texans, with a growing influx of American settlers, pushed for separate statehood, resulting in many minor skirmishes with Mexico. The first battle was because the texans kept a small cannon they borrowed. that was the start of the Texas Revolution
On March 1, 59 delegates held the Convention of 1836 at Washington-on-the-Brazos. There they drafted the Texas Declaration of Independence and adopted it on March 2.