The method used to entrap the buffalo into an enclosed area.

Corral

Explanation:

The main way in which animals are contained in a space in the United States is through the use of pens. Pens are small enclosures for holding animals. However, if the animal in question is big, such as a buffalo, the term used is often corral, which comes from Spanish. Corrals became particularly common in the Western US after the invention of barbed wire. Barbed wire transformed the existence of people and animals in the Western US.

This should be right, its barbed wire