Because  the blacks needed a period of probation and instruction. A period is long enough for the black to have forgotten something of the condition as a slave. 
        
             
        
        
        
The correct answer is Aztec.
Explanation:  The Aztecs were the main Mesoamerican civilization and one of the main pre-Columbian civilizations. They built their capital in the mid-fourteenth century and had a rich culture that inherited elements from various peoples of Mesoamerica (Central American region that corresponds to countries like Mexico, Guatemala, El Salvador etc.), such as Toltecs and Mayans. Their society was hierarchical, each having its own specific role.
 
        
             
        
        
        
No jimmy carter is not underrated 
        
                    
             
        
        
        
The introduction of the cotton gin by Eli Whitney had a great effect on the plantations, as well as slavery. Before the cotton gin was invented, the production of cotton was a… painstaking business. To remove the cotton fiber from the seeds took a great amount of time.
        
             
        
        
        
Answer:
Explanation:
Europeans carried a hidden enemy to the Indians: new diseases. Native peoples of America had no immunity to the diseases that European explorers and colonists brought with them. Diseases such as smallpox, influenza, measles, and even chicken pox proved deadly to American Indians.