Law of April 6, 1830 – in 1828, the Mexican government sent Mier y Terán to report on the new immigrants moving into Texas. He reported concerns about the Anglo Americans. This resulted in the Law of April 6 which outlawed immigration from the U.S. to Texas and canceled all empresario grants that had not been fulfilled. It did encourage European immigration. Slaves could no longer be brought into Mexico to work, and they placed customs duties on all goods entering Texas from the U.S. Overall, the Law of April 6 violated the Mexican Constitution of 1824.