Answer/explanation: China became communist. Leading the US to cut ties with them. Vietnam and Korea were split along a parallel, which divided the communist north and the democratic south
        
             
        
        
        
The Compromise of 1877 was a purported informal, unwritten deal that settled the intensely disputed 1876 U.S. presidential election. It resulted in the United States federal government pulling the last troops out of the South, and formally ended the Reconstruction Era.
        
                    
             
        
        
        
Answer:1) 3. 1973
2) 3. Saigon
Explanation: In 1973, the United States officially pulled their troops out of the war after 18 years of fighting.
North Vietnam in 1975 closed in on Saigon and bombed it, hence "The Fall of Saigon."
 
        
             
        
        
        
The three principal ways civilization spreads from one region to another is through trade, travel and warfare. When people travel, they bring with them goods from their region to another and this would be the start of contributing and sharing, and trading their ways and ideas of growing crops and raising other goods. It can also be spread through wars. Through this, different relationships emerged. Hope this answer helps. 
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