I think it would be climatic changes. After the ice age, lands became a good ground to plant food resources. People learned through experience, observation, and survival the basic things to survive the world and finally stopped in a place and build their own homes and finally settle.  They learned that hunting is not enough to sustain their needs so they studied on cultivating their lands to produce their needed food.
        
             
        
        
        
<span>d. totalitarianism.\
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Answer:
 Plessy v. Ferguson was a landmark 1896 U.S. Supreme Court decision that upheld the constitutionality of racial segregation under the “separate but equal” doctrine. As a result, restrictive Jim Crow legislation and separate public accommodations based on race became commonplace / Plessy v. Ferguson strengthened racial segregation in public accommodations and services throughout the United States and ensured its continuation for more than half a century by giving it constitutional sanction
Explanation:
 
        
             
        
        
        
even though the catholic church explores points on being kind and faithful to others the way it operates contredicts that statement due to the fact it works in a political state of mind
 
        
                    
             
        
        
        
Well from what I learned they nearly got wiped out at one point but it was great for agriculture, they grew rice and other plants but they had much flooding