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Chinese Civil War, (1945–49), military struggle for control of China waged between the Nationalists (Kuomintang) under Chiang Kai-shek and the Communists under Mao Zedong. The end of World War II and the collapse of the United Front
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Because the Turks see the Hagia Sophia as an important artifact. Also, a tradition from the Ottoman times states that Islam is the fulfiller of Judaism and Christianity, and they are all Abrahamic and that no division should take place between the three. So, the Turkish government has taken this duty into their hands and are now preserving the Hagia Sophia for the younger generations of the world to see how the Turkish government and holy Muslims want to keep peace between the religions of the world, and not only that, but how the Turkish government preserved these artifacts to show the later generations of the world intact history. 
 
        
             
        
        
        
Scarcity is the fundamental problem facing all societies. It is the condition that results from society not having enough resources to produce all the things that people would like to have.
 
        
                    
             
        
        
        
Representatives of Spain and the United States signed a peace treaty in Paris on December 10, 1898, which established the independence of Cuba, ceded Puerto Rico and Guam to the United States, and allowed the victorious power to purchase the Philippines Islands from Spain for $20 million.