Harry, you must know that the civil war was not fought to free the slaves. Lincoln himself said that if he could preserve the union and not free the slaves he would do so. Emancipation was a tactic to win the war, to get slaves to revolt and join the Northern army, which many did.  
Many of America's corporate plutocrats, including Henry Ford & the Bushes granddaddy were big Hitler supporters. Hitler awarded Ford Germany's highest civilian medal for the help he provided in building up their military.  Ford & GM both had truck factories operating in Germany throughout the war. George Herbert Walker (Bush 41's dad) was convicted of trading with the enemy, even after the war started. These fascist corporatists are not patriots -- their loyalty is only to profits for themselves. We sponsored regimes as murderous as the communist ones you quote -- if not in total numbers then in proportionate ones. We overthrew democracies in Guatemala, Iran, and Chile. Doing evil to oppose greater evil?