This means to explain the rise of terrorism. They want u to mention 9/11and what the US did in the war of Afghanistan and Iraq
        
             
        
        
        
Answer:
1986
Explanation:
The Space Shuttle Challenger disaster was a fatal accident in the United States' space program that occurred on January 28, 1986, when the Space Shuttle Challenger (OV-099) broke apart 73 seconds into its flight, killing all seven crew members aboard. It was a very tragic time in history.
 
        
             
        
        
        
A few of the significant changes is our spine, and also we used to have a tail.
        
                    
             
        
        
        
The corporation is the answer 
        
             
        
        
        
The Mayans, Incans, and Aztecs were advanced in regards to agriculture and architecture