有刺鉄線
Barbed wire, which was patented in 1874, was revolutionary in allowing farmers to protect their claims, crops, and livestock, particularly as the land started to fill up and competition for rights to and use of the land intensified. Barbed wire was a farmer's product at first, but cattlemen eventually adopted it to fence off their larger tracts of land. Barbed wire became an important factor in changing the cattle industry, as the free, open range became parceled off by barbed wire. Because of this development, the West saw the rise of big-pasture companies.