Following World War II, the major European powers divested themselves of their colonies at an increasing rate: the number of ex-colonial states jumped from about 30 to almost 120 after the war. The rate of state formation leveled off in the 1980s, at which point few colonies remained. More states also meant more states in which to have long civil wars. Hironaka statistically measures the impact of the increased number of ex-colonial states as increasing the post-World War II incidence of civil wars by +165% over the pre-1945 number.