What is the American Revolution?

The American Revolution took place between 1765 and 1783 when thirteen of England's colonies in North America rallied together and fought for their independence against King George III of the United Kingdom.
The Revolutionary War resulted due to a buildup of tensions between colonists and their king, primarily over the concept of "taxation without representation." Colonists were expected to pay taxes on items like stamps and tea without receiving direct representation in the British Parliament. Americans increasingly felt betrayed by their government in England and began protesting their treatment by King George and his Parliament.
The first military engagement of the Revolutionary War was a skirmish at Lexington and Concord, Massachusetts on April 19, 1775. Two years later the French allied with the colonists against their historical rival Great Britain, and their defeat of the British army at Yorktown, Virginia in 1781 is traditionally viewed as the end of the Revolutionary War.
The Revolutionary War established the United States of America as an independent federation with its own legal and political structure.

The American Revolution, 1775–83, was a war fought between England and her thirteen American colonies. The Americans won the war and achieved independence from England, creating the United States of America.
Relations between England and her colonies deteriorated after 1763. In that year, France was beaten in a war and ejected from the North American continent. With the French defeated, the American colonists believed that there was no longer a need for British troops in the colonies. London, on the other hand, wanted to keep troops in the colonies and have the colonists help pay for their upkeep. Also, London passed tax laws which angered many Americans. Moreover, King George III was increasingly viewed as a tyrant by many Americans.
The war was long and difficult, but George Washington's leadership and French aid enabled the Americans to prevail in the end.