The American Revolution started in 1775 with the battles of Lexington and Concord, however, in America, the Revolution had been in effect since the end of the French and Indian War. We can see this by following the Revolutionary timeline of American History.
The American Revolution Timeline
A great reference site for the student of the American Revolution.
Chronological list of American Revolution Battles
From the American Revolution Website take a look at this chronology of the battles of the American Revolution from 1775 to 1783.
Drafting the Documents Timeline
This is a chronology of events surrounding the drafting of the Declaration of Independence.