The Fetterman Massacre was an example of Plains Indians' resistance to the building of the transcontinental railroad. Which of the following statements best explains why tribes often reacted to the railroad with hostility?

A.

They feared that the railroad would cause buffalo populations to grow out of control.

B.

They were upset that the railroad would bring business to their industries.

C.

They worried that the railroad would cause too many settlers to move to the West Coast.

D.

They were angered by the railroad's constant advances into their lands.

The correct answer is D. Tribes often reacted to the railroad with hostility because they were angered by the railroad's constant advances into their lands.

Explanation:

The Fetterman massacre was a clash between the US army and the Indians on December 21, 1866 during the Red Cloud war.

In the spring of 1865, the army began to appear in the lands of free Indian prairies. Soldiers patrolled roads and telegraph lines, ventured along the Oregon Trail, deep into the land of the Powder River. This angered the Indians, who were determined to defend their territories. As a consequence, the Red Cloud War began, which ended in a victory for the Indians. The most spectacular success of the Indian tribes was the event in which they ambushed and destroyed the entire Fort Phil Kearny unit leaving no survivors, which went down in history as the Fetterman Massacre.