Revolution is the overthrow and replacement of a government or political system by the peolpe governed.
One example of revolution is the American revolutionary war. King George 111 sent British troops the colonies to enforce the laws, when the colonists refused to obey, it started the American revolutionary war in which we won.
Another example of revolution is the French and Indian revolution . It started during the attack of the Bastille in Paris. And was a period of political and social upheaval in the political history of France and Europe as a whole, during which the French governmental structure underwent radical change to forms based on Enlightenment principles of democracy, citizenship, and inalienable rights.