There are several views on this and this question is probably only going to be able to be properly answered by opinion:
World War 1: world war 1 was the worst war of all. in my opinion world war 1 was the worst because more people died and they weren't fighting for any reason. but with World War 2 they were fighting for a reason to stop Germany taking over England and successfully stopped Hitler.
World War 2: maybe worldd war 2, because houses and industries were bombed. World War 2 was the worst and most bloodiest war of all.
My opinion is World War II because of the atrocities in Europe and the nuclear bombs dropped on Japan.
Vietnam War: The Vietnam War was the worst, people torchered, killed, for no reason. Long, Coastly and was unwinable.
Iraq War: I would say that the war in Iraq was the worst war. Due to the amount civilians killed( due to suicide bombings, terrorists and artillery pounding of heavily populated towns) and the tactics and methods used
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the civil war. the reason for that is because that was the one war that we lost the most people. also we had to fight ourselves. so with out a doubt it was the civil war. sorry to say so.
WW2 Germans believe Stalin was the worst. British and US people believe Hitler was the worst. The Chinese believe Hirohito was the worst. The Confederacy during the US Civil War believed President Lincoln was the worst. King George of England was the worst to the American Colonists during the Revolutionary War of 1776. North Vietnam considered US Airmen to be war criminals, as we were bombing their cities during the Vietnam War.
For the US; Vietnam.
First its one ofthe worst races. the answer is definatly orks
France
The Vietnam War hands down. Those Vietcong are crazy.