Answer:
Group polarization has always been a thing, whether it be by class or political lean it is the way it is, no country is without strife, eventually tensions amount to the point the government can't contain it and has to get involved. I believe an American civil war is a possibility but unlikely, and probably not in our lifetime.
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The correct answer is Italy invades Ethiopia
The Fall of Nanjing happened in 1938 after a four months battle. Sudetenland was also annexed by Hitler in 1938. Invasion of Ethiopia happened during the Second Italo-Ethiopian war in 1935, which is 3 years before the other two events, even though the war with Ethiopia did last until 1939, which is four years after the invasion began.
        
                    
             
        
        
        
(in the Vietnam War) the US policy of withdrawing its troops and transferring the responsibility and direction of the war effort to the government of South Vietnam.
 
        
             
        
        
        
The amendment process was included in order to ensure that the Constitution did not become weak. This prevented any corruption or loopholes in the amendment process, keeping it from becoming something like the Articles of Confederation. Hope this helps and let me know if you have more questions!