What were the factors behind the revolutions of the late eighteenth century?

TTHE ORIGINS OF THE LATE-EIGHTEENTH-CENTURY REVOLUTIONS in British North America, France, and Haiti were complex. No one cause lay behind them, nor was revolution inevitable or foreordained. However, certain important factors helped set the stage for reform. Among them were fundamental social and economic changes and political crises that eroded state authority. Another significant cause of revolutionary fervor was the impact of political ideas derived from the Enlightenment. Perhaps most important, financial crises generated by war expenses brought European states to their knees and allowed abstract discussions of reform to become pressing realities.