A revolution led by the liberal general and politician José Santos Zelaya takes over state power in Nicaragua.

In political science, a revolution is a rapid, fundamental transformation of a society's class, state, ethnic, or religious structures. According to the sociologist Jack Goldstone, all revolutions contain "a common set of elements at their core: (a) efforts to change the political regime that draw on a competing vision of a just order, (b) a notable degree of informal or formal mass mobilization, and (c) efforts to force change through noninstitutionalized actions such as mass demonstrations, protests, strikes, or violence."