Answer:
The significant changes that affected the American west include;
1. The African American settled in the direction to make a living through ranching farming and mining.
2. The plains were retransformed the settlement fields with wheat
3. After the wars, the Americans turned their intention to the civil war Rocky Mountains and Great Britain’s. This wiped more than 19000 homesteads and ranches of the American price
4. The gold discovery in California led to floods in the west Colorado, Montana, Idaho and other states where silver was found.