Open land, no fences, and they could have large herds of cattle.
the homesteaders
Spanish
Barbed wire
There was ample ranch land and water available.
Many cowboys and ranchers still do.
They changed the west by raising cows, cattle, and many other animals then they killed them for people to have fresh meat.
Farmers need to enclose the land (to protect their planted crops) - they used barbed wire for this. Ranchers needed unimpeded open plains to drive their cattle across (the cattle got entangled in the wire).
limited water
It was cheap. Before this, ranchers had to use wood and wood is scare in parts of the West.
frontiersmen seeking adventure and farmers and ranchers seeking land
Miners for gold ranchers farmers for land mormons for religous freedom
Clayton Jennings has written: 'Handshake, code of the West' -- subject(s): Ranchers, Biography