In 1528, the Spanish explorer Alvar Nunez Cabeza de Vaca and his three companions were shipwrecked and, looking for help, began an eight-year trek through the deserts of the American West.
Over the centuries, they hosted a complicated series of international.
The frontiers were the lands near or beyond the recognized international, national, regional, or tribal borders.
Geological Survey.
Over three centuries later, the four "Great Surveys" in the United States were consolidated into the U.
S.
In 1528, the Spanish explorer Alvar Nunez Cabeza de Vaca and his three companions were shipwrecked and, looking for help, began an eight-year trek through the deserts of the American West