9th February » American Revolutionary War: The Parliament of Great Britain known as British Parliament declares Massachusetts in rebellion.
8th March » An anonymous writer, thought by some to be Thomas Paine, publishes "African Slavery in America", the first article in the American colonies calling for the abolitionism in the United States known as emancipation of slaves and the abolition of slavery.
14th April » The first Abolitionism in the United States named abolition society in North America is established. The Pennsylvania Abolition Society known as Society for the Relief of Free Negroes Unlawfully Held in Bondage is organized in Philadelphia, Pennsylvania b
18th April » American Revolution: The Battles of Lexington and Concord called British advancement by sea begins; Paul Revere and other riders warn the countryside of the troop movements.
19th April » American Revolutionary War: The war begins with an American victory in Concord during the battles of Lexington and Concord.
20th April » American Revolutionary War: the Siege of Boston begins, following the battles at Battles of Lexington and Concord called Lexington and Concord.
10th May » American Revolutionary War: A small Colonial militia led by Ethan Allen and Colonel Benedict Arnold Capture of Fort Ticonderoga known as captures Fort Ticonderoga.
10th May » American Revolutionary War: Representatives from the Thirteen Colonies begin the Second Continental Congress in Philadelphia, Pennsylvania named Philadelphia.
17th May » American Revolutionary War: the Continental Congress bans trade with Province of Quebec (1763-1791) named Quebec.
20th May » Mecklenburg Declaration of Independence is signed in Charlotte, North Carolina or Charlotte, North Carolina
31st May » American Revolution: The Mecklenburg Resolves are allegedly adopted in the Province of North Carolina.
12th June » American Revolution: British Army British general Thomas Gage declares martial law in Massachusetts Colony Massachusetts. The Great Britain British offer a pardon to all colonists who lay down their arms. There would be only two exceptions to the amnesty:
14th June » American Revolutionary War: the Continental Army is established by the Continental Congress, marking the birth of the United States Army.
15th June » American Revolutionary War: George Washington is appointed commander-in-chief of the Continental Army.
17th June » American Revolutionary War: Colonists inflict heavy casualties on British forces while losing the Battle of Bunker Hill.
3rd July » American Revolutionary War: George Washington takes command of the Continental Army at Cambridge, Massachusetts.
5th July » The Second Continental Congress adopts the Olive Branch Petition.
8th July » The Olive Branch Petition is signed by the Continental Congress of the Thirteen Colonies.
26th July » The office that would later become the United States Post Office Department is established by the Second Continental Congress.
20th August » The Spain e.g Spanish establish the Presidio San Augustin del Tucson in the town that became Tucson, Arizona.
17th September » American Revolutionary War: The Invasion of Canada (1775) named Invasion of Canada begins with the Siege of Fort St. Jean.
13th October » The United States Continental Congress orders the establishment of the Continental Navy (later renamed the United States Navy).
18th October » African-American poet Phillis Wheatley is freed from slavery.
18th October » American Revolutionary War: The Burning of Falmouth (now Portland, Maine) prompts the Continental Congress to establish the Continental Navy.
26th October » King George III of Great Britain goes before Parliament to declare the American colonies in rebellion, and authorized a military response to quell the American Revolution.
28th October » American Revolutionary War: A British proclamation forbids residents from leaving Boston.
10th November » The United States Marine Corps is United States Marine Corps birthday ball known as founded at Tun Tavern in Philadelphia by Samuel Nicholas.
13th November » American Revolutionary War: Patriot revolutionary forces under Gen. Richard Montgomery occupy Montreal, Quebec.
2nd December » The USS Alfred 1774 6 becomes the first vessel to fly the Grand Union Flag (the precursor to the Flag of the United States Stars and Stripes); the flag is hoisted by John Paul Jones.
5th December » At Fort Ticonderoga, Henry Knox begins his historic Noble train of artillery known as transport of artillery to Cambridge, Massachusetts.
9th December » American Revolutionary War: British troops lose the Battle of Great Bridge, and leave Virginia soon afterward.
31st December » American Revolutionary War: Battle of Quebec (1775) called Battle of Quebec: Kingdom of Great Britain or British forces repulse an attack by Continental Army General Richard Montgomery.