It was due to so many combatants and number of countries fighting . At the peak of the war in 1942-43 over 38 countries with a combined population of 1.2 billion, had 48 million people under arm in the conflict. This, combined with new technology and the ruthlessness of Hitler, Stalin, Chang Kei Shek, Mao Tse Tung, is what caused the majority of the 72 million deaths.
World War II is the deadliest war in history.
yup it fu<kin was
because of the bomb america dropped on japan
The war was the deadliest in history up to that point
There can be no doubt that the most deadliest weapon of world war 2 was the nuclear bombs that dropped on Hiroshima.
American Civil War
hahahahaha
It was the most deadliest war with over 62 to 78 million casualties.
The Civil War World War 1 The Revolutionary War
The A-bomb.
The Atomic Bomb?
Yes, and WW2 had the most casualties world-wide.