The encomienda system was seen as a true trusteeship among the
population, as opposed to the repartimiento system which was seen as
abusive, and was thought to promote unethical behavior.
President Andrew Jackson didn't want to have a war with Mexico but also did not want to deal with adding what could be another slave State. Jackson believes that if Texas was annexed, the other countries would view the United States a traitors. He was passionate about Texas but he was more passionate about keeping the Union together.
The answer is August Vollmer