Some twentieth century ones:
Ongoing cold war in 2010: Russia/the USSR not involved
Effects of "Second great depression" somewhere between 1945 and 2000: world or regional
Rise of a new religion: effectiveness at spreading comparable to Islam in its first century
Powerful "Third World" block
Large-scale success of non-totalitarian socialism rather than communism (a few nasty "outliers" OK)
World divided into clear-cut blocks, but more of a Great Power level of hostility rather than full blown Cold War.
Bruce
Ongoing cold war in 2010: Russia/the USSR not involved
Effects of "Second great depression" somewhere between 1945 and 2000: world or regional
Rise of a new religion: effectiveness at spreading comparable to Islam in its first century
Powerful "Third World" block
Large-scale success of non-totalitarian socialism rather than communism (a few nasty "outliers" OK)
World divided into clear-cut blocks, but more of a Great Power level of hostility rather than full blown Cold War.
Bruce