World wars (events)World warsFirst World War (1914-1918) First World WarFirst World War, 1914-1918World War, 1914-1918World War IWorld war oneWorld war one (1914-1918)World War One, 1914-1918Second World War (1939-1945) Second World WarSecond World War, 1939-1945World War, 1939-1945World War IIWorld war twoWorld war two (1939-1945)World War Two, 1939-1945Seven Years War (1756-1763) French and Indian War