Answer:
first of all nice pfp The bloodiest day in American history was indeed the Battle of Antietam, which took place on September 17, 1862. The Union suffered around 12,400 casualties, including approximately 2,108 killed.
In terms of World War II battles, the number of casualties suffered at Antietam was more than twice the number of casualties suffered by the Allies during the D-Day landings at Normandy on June 6, 1944. The total number of Allied casualties on D-Day was around 4,400, with approximately 2,500 killed.
Step-by-step explanation: