World War 2 involved a much larger number of countries and combatants than World War I. Over 100 million people were mobilized in World War II, compared to around 65 million in World War I. The fighting also took place on a much larger scale, with battles involving millions of troops and taking place over thousands of miles.
2. Technological developments
World War II saw the development and widespread use of new and more powerful weapons, including the atomic bomb, radar, jet engines, and assault rifles. These technologies had a profound impact on the conduct of the war, allowing for faster, more mobile warfare and the ability to strike targets from a greater distance.
3. Civilian involvement
World War II saw a much higher level of civilian involvement than World War I. Millions of civilians were killed or injured in bombing raids, and many more were displaced from their homes. The Holocaust, in which six million Jews were murdered by the Nazi regime, was also a unique feature of World War II.
4. Global impact
World War II had a far greater global impact than World War I. The war affected countries on every continent, and its consequences were felt for decades afterwards. The war led to the creation of the United Nations and the Cold War, and it shaped the political, economic, and social landscape of the modern world.
In conclusion, World War 2 was a much more destructive and far-reaching conflict than World War I. The scale of the fighting, the technological developments, the civilian involvement, and the global impact all set World War II apart from its predecessor.