Which was an obstacle to the settlement of the american west? the cumberland gap the northwest territory the great plains the louisiana territory\

An obstacle to the settlement of the American West was the Great Plains.

Explanation:

The Great Plains is a vast prairie area east of the Rockies in the United States and Canada. The plains extend to the states of New Mexico, Texas, Oklahoma, Colorado, Kansas, Nebraska, Wyoming, Montana, South Dakota and North Dakota in the United States, and the provinces of Alberta, Manitoba and Saskatchewan in Canada.  As it was a very wide area of land completely uninhabited in colonial times, it was a challenge to American expansion to the west.

true. earthquakes are felt whenever there is a slip around a fault in the rocks below the earth. this reorientation of faults create sesmic waves and is known as earthquake, the severity of which is measured in richter scale. these are more prominent in hilly regions as the rocks usually form faults to balance the pressures on it.