Which describes one reason for the end of long cattle drives?

a.
demand for beef declined drastically in the years after the civil war.

b.
as homesteaders moved into areas along cattle trails, they fenced their farms.

c.
cattle were forced off the prairie by enormous herds of buffalo.

d.
cowboys became dissatisfied with low wages and went on strike.

in contrast, the biological controls are self-sustaining, inexpensive and very effective once established. biological control could be used on thousands of golf course acres, improving their biodiversity and quality as wildlife habitat. in the process, the golf industry will be shown to be leaders in an environmental stewardship program of benefit not only to the lands they manage but also to the watersheds in which they exist.

nothing certain is known about what happened, but it seems that the country declined gradually, perhaps due to bad government, or, more likely, due to a series of bad harvests, which resulted in widespread and recurrent famine.