Although many Mexicans wanted to abolish slavery, fears of an economic crisis if all of the slaves were simultaneously freed led to a gradual emancipation policy.  In 1823, Mexico forbade the sale or purchase of slaves and required that the children of slaves be freed when they reached fourteen.  Any slave introduced into Mexico by purchase or trade would also be freed.  By 1825, however, a census of Austin's Colony showed 1,347 Anglo-Americans and 443 people of African descent, including a very small number of free African Americans.  Two years later the legislature of Coahuila y Tejas outlawed the introduction of additional slaves into the state and granted freedom at birth to all children born to a slave.  The new laws also stated that any slave brought into Texas should be freed within six months. 
Three years later, the Gadsden Purchase settled most of the remaining issues regarding the disputed border between the United States and Mexico. The need for a southern transcontinental railroad route and the inability of the United States to control Apache raids into Mexico led to a modification of the Treaty of Guadalupe Hidalgo. The resulting agreement, negotiated by James Gadsden and Antonio Lopez de Santa Anna , sold additional Mexican territory to the United States and established the borders as they exist to the present day. Surprisingly, the final arrangements were for the least amount of territory requested by the United States at the maximum price authorized by Gadsden's instructions.
Emma Sanchez: "It's very hard to see these little persons and not being able to embrace them, see my little niece and not being able to embrace her. Hear her saying she wants to come to the house, and knowing that she can't come to the house, that I can't bring her, that it isn't something possible. I think it's like prison, jail, the way that they put these walls here. This wall is something really painful. It is inhumane."