Explanation:
umm well I think that a way that environmental factors have affected the human population since 1900 is that as the environment probably gets worse then it could effect the human population idk I hope that I helped in any way 
 
        
             
        
        
        
Battle of the Antietam September 17 1862, on the day there was no clear winner on the battle field even though there were 23000 casualties. But strategic winner was the north. General Lee withdrew his troops from Maryland and was never seen there again.  
        
             
        
        
        
Answer:
d
Explanation:
because it decides who will be the speaker of the house