The American Revolution refers to the period during the last half of the 18th century in which the Thirteen Colonies that became the United States of America gained independence from the British Empire.
In this period, the Colonies united against the British Empire and entered a period of armed conflict known as the Revolutionary War or as the American War of Independence, between 1775 and 1783. This culminated in an American Declaration of Independence in 1776, and victory on the battlefield circa 1781.
Following Grantville's arrival in 17th century Europe, Michael Stearns announced during the Emergency Town Meeting that Grantville would have to kick-start the American Revolution a "150 years earlier" by introducing the concepts of American democracy to a near feudal Europe. The ideas of the Revolution inspired in the creation of the Committees of Correspondence, among other things.
King Charles I of England, having learned of the Revolution through smuggled history books, and lacking interest in America generally, concluded that colonization in the Americas wasn't worth the effort in the long run, and gave up all English possessions in North America to France.