Answer:
Christopher Columbus was an Italian explorer and colonizer who completed four voyages across the Atlantic Ocean that opened the New World for conquest and permanent European colonization of the Americas.
Explanation:
 
        
                    
             
        
        
        
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They would contain a higher concentration of minerals and nutrients than the surrounding soil<span />
        
                    
             
        
        
        
The Missouri Compromise of 1820 established the latitude 36°30′ as the northern limit for slavery to be legal in the territories of the west. 
Explanation:
- The Missouri Compromise, as it was known, would remain in impact for just over 30 years till the Kansas-Nebraska act of 1854 revoked it. 
 - In 1857, the Supreme Court in Dred Scott's case found the agreement unconstitutional, setting the stage for the nation's final journey through the Civil War.
 - In 1820, while growing sectional tensions over the slavery issue, the U.S. Congress passed a law welcoming Missouri to the Union as a captive state and free state.