SAT US History Practice Question

The development of barbed wire in the second half of the 19th century was most significant in the history of the West because it

1. A.was used along railroad tracks to prevent animals from going onto the tracks.
2. B.enclosed Native American reservations, preventing mingling between Native Americans and whites.
3. C.enabled farmers to enclose their land, thus preventing cowboys from taking cattle on long runs.
4. D.allowed prospectors to protect their strikes from competitors.
5. E.was used to build a fence between Mexico and the United States to prevent illegal immigration into the United States.