They adapted to their environment by using terrace farming, which was very important. Terrace farming is when they cut steep hills and they would build rope bridges to cross the mountains.
        
             
        
        
        
Plentiful water supply and rich fertile land, basic must for humans , the start of the growth
        
             
        
        
        
I believe the answer is A, good luck
        
             
        
        
        
Answer:
slavery
Explanation:
Just before the Civil War, there were 19 free states and 15 slave states. During the war, slavery was abolished in some of these jurisdictions, and the Thirteenth Amendment to the United States Constitution, ratified in December 1865, finally abolished slavery throughout the United States.
 
        
             
        
        
        
Populism rise to promote democratization and to have a government for the people. In Brazil, populism was used by their President Getulio Vargas to be in his place. In Argentina, the government used populism to increase wages but resulted in inflation because of instability to sustain economic reforms to people.