Presented in English and Spanish, Borderlands explores the shifting geopolitical history of southern Colorado. This area framed by mountains and rivers is naturally conducive to unique and resilient forms of cultural connection. An international border crossed over the people in this region, changing their lives forever, when the Treaty of Guadalupe Hidalgo moved a portion of the US–Mexico border from the Arkansas River—which flows through the middle of Colorado—down to the Rio Grande in 1848.