The tribes which inhabited the southern plains of the United States, aptly called the “Buffalo Indians,” all originated in another region of North America. As the 19th century progressed, these groups of people were well adapted and thrived in their environment. The middle of the century; however, proved to be increasingly challenging to the Native American tribes as the U.S. government sought to contain, if not eliminate, these nomadic hunters in order to exploit the region and its resources for the advancement of westward expansion. In 1865 the American Civil War had at last come to an end, thus allowing for an increased military presence in Texas and the Southern Plains region. Further, the intercontinental railroad was completed in 1868, which increased the rate of the transportation of goods to the East and migrant settlers to the West.