 Complete the following phrase:  The MexicanAmerican War ended with the signing of the Treaty of Guadalupe Hidalgo in 1848. In the treaty, Mexico ceded a large portion of northern Mexico in what is now the southwestern United States. With the acquisition of this large territory, Congress began debating how to organize it. Initially, there was no cause to rush the organization, as the territory was sparsely populated. However, with the 