What was the biggest obstacle in american western expansion?

rather states would be freed or slavery

Explanation:

because america was doing so well and getting so much new territory, the biggest obstacle was themselves. with the new territory, the balance of free and slave states grew tension among american and resulted in the civil war

the answers is b.   environments.

after world war ii, the united states and the soviet union were the major economic, military, and political powers. the world was bilateral multipolar bipolar unilateral

after world war ii, the united states and the soviet union were the major economic, military, and political powers. the world was bipolar.  

the great leap forward, mao zedong's plan to increase china's agricultural and industrial production, was an overwhelming success. true false

the great leap forward, mao zedong's plan to increase china's agricultural and industrial production, was an overwhelming success. true.

explanation: