Nobody knows for certain. But it's been determined that it was not the work of a preditors. Many think that aliens are responsible but so far nobody has been able to prove it.
Grenville Dodge
Spanish Conquistadors embarked on exploration of the southwestern US
Grenville Mellen Dodge
Southwestern
Nothing. The only "contribution" they ever made to the early American cattle industry was let loose a bunch of Spanish cattle that are now ancestors to the Texas Longhorn and Florida Cracker cattle. After the civil war, there were millions of cattle in southwestern USA that needed to be rounded up and shipped to eastern markets to meet the increasing demand for beef.
Mexico is directly south of and adjacent to the southwestern US.
The first person to bring cattle into what is now the United States was likely Christopher Columbus, who introduced cattle to the Caribbean during his voyages in the late 15th century. However, it was Spanish explorers and settlers, such as Hernán Cortés in the early 16th century, who brought cattle to mainland North America, particularly to regions that are now part of Mexico and the southwestern United States. These early introductions laid the groundwork for the cattle industry in the U.S.
Canada
Mexico borders southwestern US. Mexico City is the capital and most populous city of Mexico.
It is in the southwestern United States.
no
No, it is in the southwestern US.