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The United States later declared war on German ally Austria-Hungary on December 7, 1917. Germany's resumption of submarine attacks on passenger and merchant ships in 1917 became the primary motivation behind Wilson's decision to lead the United States into World War I.
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Answer:
The Middle Ages was when the Priests and the Catholic Church were the controllers of society because they were the ones who had education and they were the ones who had hand-written the bible. Also, the Middle Ages had feudalism who had serfs (serfs=illiterate).
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The Louisiana Purchase, which was purchased by the United States from France, greatly impacted the development of the US in that it gave the US a large area of land for extremely cheap. 
        
             
        
        
        
It allowed for slaves to be counted as people halfway to please the abolitionists, but didn't allow them to be citizens to please the pro-slavery side.