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WWI was fought between 1914 and 1918 while WWII was fought between 1939 and 1945. The two warring groups of WWI were the Allied Powers and the Central Powers while the two warring groups of WWII were The Allies and The Axis powers.
What is the difference between World War 1 and World War 2?World War I vs. World War II. The First World War (WWI) was fought from 1914 to 1918 and the Second World War (or WWII) was fought from 1939 to 1945. They were the largest military conflicts in human history. Both wars involved military alliances between different groups of countries