Why do cattle owners have to buy private property on which to keep their cattle?

They couldn’t graze their cattle on native American reservations
Cattle and range herd got mixed together
Farms and the railroad carved up the open range
Diseases often wiped out entire herds

Cattle owners have to buy private property on which to keep their cattle for a variety of reasons. One reason is that they couldn't graze their cattle on Native American reservations due to restrictions and regulations imposed by the tribal governments. Additionally, the cattle and range herds often got mixed together, making it necessary for owners to have a designated area for their cattle. Furthermore, farms and the railroad carved up the open range, making it difficult for cattle to roam freely. Finally, diseases often wiped out entire herds, so having a controlled environment on private property helped protect the cattle from contracting diseases.