Nuevo Santander (New Santander) was a region of the Viceroyalty of New Spain, covering the modern Mexican state of Tamaulipas and extending into modern-day southern Texas in the United States. A history of Texas, commissioned by the U.S. government's Federal Writers' Project in 1934, noted that "The borders of New Santander did not stop at the Rio Bravo" (the Mexican name for the Rio Grande); and added that the borders "went north to the Nueces, near Corpus Christi, then west and north to the Medina, then south again on a line along Laredo to the eastern slopes of the Sierra Madres, deep in Mexico."