Which best explains how the Mongols under Genghis Khan were able to establish and maintain a large empire?

hope it helps..

Explanation:

They were skilled horsemen who adopted new military technologies and used terror as a weapon.

d) a week

because the land run of 1889, although not without precedent in the history of the west, further, their men were aboard the first trains, ready to jump off and begin staking their claims. oklahoma city, edmond, and guthrie were all so affected.

the answer is b: an economic crisis throughout the country.