April 14 - American Revolutionary War: Massachusetts Governor Gage is secretly ordered by the British to enforce the Coercive Acts and suppress open rebellion by an iron hand.
April 18 - American Revolutionary War: General Gage orders 700 troops to Concord to destroy the rebels' weapons depot.
April 18 - American Revolutionary War: Paul Revere makes his famous midnight ride - "Listen my childen, and you shall hear of the midnight ride of Paul Revere on the eighteenth of April, in seventy-five; hardly a man is now alive who remembers that famous day and year" (Henry Wadsworth Longfellow).
April 19 - American Revolutionary War: The Battle of Lexington and Concord begins at dawn with a volley on 70 armed Massachusetts militiamen on Lexington Green by the British advance guard, which leaves 8 dead and 10 wounded - "the shot heard around the world".
May 10 - American Revolutionary War: The Continental Congress meets, elects John Hancock president, and authorizes the colonies to adopt their own constitutions.
August 23 - American Revolutionary War: Refusing to even look at the Olive Branch Petition, King George issues a Declaration of Rebellion against the American colonies.
July 6 - American Revolutionary War: The Continental Congress issues Declaration of the Causes and Necessity of Taking Up Arms, which contains the words: "Our cause is just. Our union is perfect... being with one mind resolved to die freemen rather than to live slaves...".