1780 in the United States

• January 16 – American Revolutionary War – Battle of Cape St. Vincent: British Admiral Sir George Rodney defeats a Spanish fleet.
• February 3 – American Revolutionary War: Battle of Young's House
• March 1– Pennsylvania is the first American state to abolish slavery.
• March 29–May 12 – American Revolutionary War: Siege of Charleston

June 23: Battle of Springfield

• April 14 – American Revolutionary War: Battle of Monck's Corner
• May 6 – American Revolutionary War: Battle of Lenud's Ferry
• May 12 – American Revolutionary War: Charleston, South Carolina is taken by British forces.
• May 13 – Cumberland Compact signed by American settlers in the Cumberland Valley of Tennessee.
• May 19 – New England's Dark Day: An unaccountable darkness spreads over New England, regarded by some observers as a fulfillment of Bible prophecy.
• May 25–August 4 – American Revolutionary War: Bird's invasion of Kentucky
• May 29 – American Revolutionary War: Waxhaw Massacre: Loyalist forces under Col. Banastre Tarleton kill surrendering American soldiers.
• June 7 – American Revolutionary War: Battle of Connecticut Farms
• June 10 – American Revolutionary War: Battle of Mobley's Meeting House
• June 20 – American Revolutionary War: Battle of Ramsour's Mill
• June 23 – American Revolutionary War – Battle of Springfield: The American victory at Springfield effectively ends British ambitions in New Jersey.

August 16: Battle of Camden

• July 11 – Expédition Particulière: French soldiers arrive in Newport, Rhode Island to reinforce colonists in the American Revolutionary War.[1]
• July 12 – American Revolutionary War: Battle of Williamson's Plantation
• July 21 – American Revolutionary War: Battle of Colson's Mill
• August 1 – American Revolutionary War: Battle of Rocky Mount
• August 6 – American Revolutionary War: Battle of Hanging Rock
• August 8 – American Revolutionary War: Battle of Piqua
• August 16 – American Revolutionary War: Battle of Camden: British troops inflict heavy losses on a Patriot army at Camden, South Carolina.
• August 18
  • American Revolutionary War: Battle of Fishing Creek
  • American Revolutionary War: Battle of Musgrove Mill
• August 28 – American Revolutionary War: Battle of Black Mingo
• September 21
  • American Revolutionary War: Battle of Wahab's Plantation
  • Benedict Arnold gives detailed plans of West Point to Major John André. Three days later, André is captured with papers revealing that Arnold was planning to surrender West Point to the British.
• September 25 – Benedict Arnold flees to British-held New York.
• September 26 – American Revolutionary War: Battle of Charlotte

October 7: Battle of Kings Mountain

• October 2 – American Revolutionary War: In Tappan, New York, British spy John André is hanged by American forces.
• October 7 – American Revolutionary War – Battle of Kings Mountain: Patriot militia forces annihilate a Loyalists under British Major Patrick Ferguson at Kings Mountain in South Carolina.
• October 16 – American Revolutionary War – Royalton Raid
• October 17 – American Revolutionary War – Battle of Shallow Ford
• October 19 – American Revolutionary War – Battle of Klock's Field
• October 25 – American Revolutionary War – Battle of Tearcoat Swamp
• November 9 – American Revolutionary War – Battle of Fishdam Ford
• November 20 – American Revolutionary War – Battle of Blackstock's Farm

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• Woodford Reserve bourbon whiskey distillery begins operation in Kentucky.

• American Revolutionary War (1775–1783)