How the Rio Grande Was Engineered into a Border
Twisting waters once blurred the boundary, but twentieth-century engineering turned the Rio Grande into a fixed, policed line.
The Busy, Beneficial Beaver
Americans have long viewed beavers as nuisances. But their dams are important for water management, helping to store and recharge depleted groundwater.
The River Basin Surveys Preserved American Prehistory
Between 1945 and 1969, archaeologists hurriedly surveyed over 20,000 prehistorical sites before the Mississippi River Basin was flooded by dams.