slaves are treated as the personal assets of their masters unlike servants
slaves are never remunerated for their services while servants are working in exchange for a previously agreed upon amenity, free accomodation or passage to another country.
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It was "Karl Marx" who envisioned a classless society, with common people in charge of their destiny, since this was the basis of communism, which came to fruition most famously in the Soviet Union.  
        
             
        
        
        
Answer:
Japanese aircraft carriers had approached Hawaii unnoticed.
As a result of Japan’s attack on pearl Harbor thousands of American died and the Us declared war on Japan.  
The surprise attack of Japan at Pearl Harbor in Hawaii on December 7th, 1941 had killed many Americans and destroyed American ships and Airplanes along with USS Arizona, the crown of US Navy.  
However, Americans have no intention in joining the Allied forces in the World War II, the drastic incident at the Pearl Harbor made them to join the war. American president FDR declared war on Japan. This made the Germany to declare war on America. The triangular declaration of war made the Americans to involve in the World War II, completely.