According to Dr. K, what important role did trains play in the settlement of the West?

it opened up the west to the rest of America

Explanation:

According to Dr. K the trains played an important role in developing the economy of the West by opening the West up to commercial activities in large quantities across the whole of America and also neighboring countries.

The trains ensured that the movement of goods and services in and out of the west was efficient and reliable and this played a huge role in the economic boost experienced in the West during this Era. it also encouraged the settlement and the arrival of migrants in the west as well.

Answer: The construction of rail road in the great west opened it up to the rest of America, this made it easy for people and goods to be transported. It also brought about economic growth that created more job opportunities and also encouraged a lot of immigrants to settle and work in the West. This boosted the economy of the West.