1) A. Texans wanted the rights of Ameican citizens. 1) B. Texas would tip the balance in Congress in favor of slave states, thus allowing pro-slavery laws to be enacted. 2) A. The U.S. gained the Mexican Cession. 2) B. It caused hostility and suspicion. 4) And Texas agreed, also because Texas would receive more land. 5) And last its constitution. 6) Which led to another attack and led to Santa Anna's demise.