Its because the part of the country that tried to secede in the civil war, the "South" is basically a third world country where the plebs would prefer to be ruled by a christian theocracy as long as they guaranteed to kill all gays, blacks, and immigrants, and enforce their own version of western sharia law.
A great deal of the country definitely doesn't share those views, but hey these guys vote Republican so its in some politicians' best interest to appease the bumblefuck regressive hicks.
To respond to some criticisms:
Nuclear bombing in WW2 is no different then what any air force would've done to end the war sooner for their nation, the RAF and Luftwaffe bombed civilian targets every chance they got. America was just the best at it. Of course that doesn't make it right, but.. deal with it.
Also, accusing the USA of the most wars in human history? Haha, what? I think credit can go to the British Empire for that one, shitting up the world for hundreds and hundreds of years. America's only been in the business of fucking with shit nations halfway across the world for the past 50 years, not the past 500.