The correct answer is "A". 
The Domino Theory was developed in 1950 in the US administration. It proposed the idea that if one country in a region was governed by a left-wing power which shared communist beliefs, neighbor countries will follow suit.  This led the United States to get involved in numerous armed conflicts around the world, such as the Korean War, in order to prevent the spread of Communism.
 
        
                    
             
        
        
        
Answer:
Pascal's law says that pressure applied to an enclosed fluid will be transmitted without a change in magnitude to every point of the fluid and to the walls of the container. The pressure at any point in the fluid is equal in all directions.
Explanation:
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Answer:
nationalism, militarism, alliances, and imperialisation
Explanation:
lead to armed conflict and two main sides
 
        
             
        
        
        
Answer:
The Inca fell by a combination of civil war and the Spanish invasion.
Explanation: