Keep the law the way it is!
But why should we..?
Settlement of Texas
Spain owned a decently large part of North America, which included Texas. Moses Austin, from the United States, was given permission by the Spanish government to start a colony in Texas as long as his colony followed Spanish laws. While Moses Austin was attempting to start a colony, he died in 1821. Therefore, his son Stephen tried to start the colony.
In 1821, Mexico was independent from Spain (Including Texas).
Now, the Americans had to follow the Mexican customs such as becoming Mexican citizens, becoming members of the Roman Catholic Church, and learning Spanish. They agreed to that. In 1829, the Mexican government outlawed slavery, which upset the Americans. They wanted to keep the slaves so their cotton farms would prosper, and very few settlers learned Spanish and converted to Catholicism. The Mexican government realized that Americans were not doing as they had said they would, so in 1829, they closed Texas to further American immigration