Many Hispanic activists, Mexican citizens and perhaps even members of the Mexican government believe the American Southwest rightfully belongs to Mexico. They refuse to accept the legality of the U.S. annexation of Texas in 1845, the 1848 Treaty of Guadalupe Hidalgo following the Mexican-American War, which gave large parts of Mexico to the U.S., or the 1852 Gadsden Purchase of Mexican territory now in Arizona and New Mexico. Story Continues Below A Zogby poll found that 58 percent of Mexicans agreed with the statement, "The territory of the Southwest U.S. rightfully belongs to Mexico," and therefore they believe they don't...