"The Texas Revolution, also known as the Texas War of Independence, was the military conflict between the government of Mexico and Texas colonists, most of whom

"The Texas Revolution, also known as the Texas War of Independence, was the military conflict between the government of Mexico and Texas colonists, most of whom were land owners from the United States." - Wikipedia They let a bunch of Americans settle in Texas because they basically had open borders and then they seceded in a huge land grab.