Why did the cattle trail became less important in the late 1800's?

Explanation:

Cattle have been raised in Texas from the time the Spanish attempted to establish missions and domesticate the Indians, beginning in the mid-18th century.

It was primarily a small-scale industry during the Republic and early statehood. Most cattle were slaughtered for their hides and tallow, since the meat could not be preserved for long with the methods then used.

Many of the early cattle were longhorns, descendants of Spanish ranch and mission herds, with horn spreads of four to eight feet. Some had become crossed with Mexican cattle, shorter-horned and dun-colored. But there also were cattle of British origin, brought west by Anglo-American colonists from the East Coast by way of Northeast Texas.

c. wright mills's sociological imagination suggest investigating to explain this increase?

the density would be a smaller number.