I hope you’re asking the reasoning because here are five:
1. Oversupply lead to drastic fall in prices for beed
2. land could no longer support the grazing of the animals
3. barbed wire was invented and farmers fenced off their land reducing the open range where cattle could graze- meaning that farmers had to buy expensive food for their cattle.
4. hot summers and harsh winters in 1886-1887 killed thousands of cattle and put ranchers out of business
5. Economic depression put many out of work in the east so demand dropped