The Soviet Union.
Russia
Russia had the highest total casualties in WW2, they claimed that over 20 million people died in Russia
The Soviet Union.
Highest casualties - Gettysburg (3-day battle) Highest casualties in one day - Antietam/Sharpsburg
The country with the highest number of casualties was the Soviet Union.
It had the highest casualties of any battle in the war.
Antietam
world war 2 was the deadliest war because there was more destruction,civilian casualties,and military casualties than any war.
That was Gettysburg.
You mean with highest number of casualties? That would be the Mexican Revolution (1910 - 1921) with more than 1 million casualties.
battle of antetiem American civil war
Russia. They lost some 23 million people, with China in second losing some 20 million.