What are the negative and positive effects the Mexican Cession had on the US?

The Mexican Cession, resulting from the 1848 Treaty of Guadalupe Hidalgo, significantly expanded U.S. territory, adding present-day California, Nevada, Utah, and parts of Arizona, New Mexico, Colorado, and Wyoming, which offered vast resources and economic opportunities. However, it also intensified the debate over slavery in the new territories, exacerbating sectional tensions that contributed to the Civil War. The acquisition led to conflicts with Native American tribes and increased tensions with Mexico, shaping future U.S.-Mexico relations. Overall, while it facilitated westward expansion, it also deepened divisions within the nation.