From the late 1980s, a new body of scholarly work began questioning the dominance of the third generation's theories. The old theories were also dealt a significant blow by new revolutionary events that could not be easily explained by them. The Iranian and Nicaraguan Revolutions of 1979, the 1986 People Power Revolution in the Philippines and the 1989 Autumn of Nations in Europe saw multi-class coalitions topple seemingly powerful regimes amidst popular demonstrations and mass strikes in nonviolent revolutions.