It was mostly "amassing the largest armies ever in one place" that resulted in the single bloodiest day in American history at the Battle of Antietam, since although this was technically a Union victory, both sides were fairly evenly matched. 
        
                    
             
        
        
        
Foreign Invasion. A series of foreign invasions affected Mughal Empire very badly. Attacks by Nadir Shah and Ahmad Shah Abdali, which were themselves the consequences of the weakness of the Empire, drained the Empire of its wealth, ruined its trade and industry in the North, and almost destroyed its military power.
        
             
        
        
        
it is a- you have too be screened because weapons have never been allowed but now you could have a gun in a pocket or smtg and put people at risk 
 
        
             
        
        
        
The answer is b, a union general who later become the 18th president on the united states.
        
                    
             
        
        
        
Just cause djfjfjfjfnfnfngngngngngngnhnhnhnu u u