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

(1 point)
• They couldn't graze their cattle on Native American reservations.
• Cattle in open-range herds got mixed together.
• Farms and the railroads carved up the open range.
• Diseases often wiped out entire herds

Cattle owners had to buy private property on which to keep their cattle because farms and the railroads carved up the open range, making it difficult to maintain open-range herds.