1865 May Am Civil War Gazette

- Military Tribunal is ordered by President Johnson to try Lincoln's assassins
- "Trial of the Assassins" is a lead story most of the month

- Grand Review of the Armies (Washington, D.C.)

- Expedition from Brazos Santiago (Texas)
- Battle of Palmito Ranch

- South Carolina
- Battle of Anderson

- Johnston's Florida "Brigade of the West" surrenders at Greensboro, North Carolina

- Gen. Taylor surrenders the Confederate Department of Alabama, Mississippi and East Louisiana in Alabama

- Gen. D.H. Maury surrenders the Confederate District of the Gulf at Citronelle, Alabama

- Gen. Nathan Bedford Forrest surrenders at Gainesville, Alabama

- Gen. Samuel Jones surrenders the Confederate Department of Florida and South Georgia at Tallahassee, Florida

- President Andrew Johnson declares armed resistance "virtually ended" and immunity ended

- Mobile ordnance depot explosion

- Pursuit of Jefferson Davis
- President Jefferson Davis and cabinet declare the C.S.A. dissolved in Washington, Georgia
- Jefferson Davis is captured

- Gen. Jeff Thompson surrenders the Thompson Brigade at Wittsburg and Jacksonport, Arkansas

- Gen. W.T. Wofford surrenders the Confederate District of Northern Georgia at Kingston, Georgia

- Gen. Kirby Smith surrenders the Confederate Trans-Mississippi Department
- Last organized Confederate force to surrender

- Colorado War (Colorado Territory)
- Engagement at Deer Creek Station (Wyoming)
- Lakota raid at Sweetwater Station
- Lakota raid at St. Mary's Station
- Hanging of Oglala leaders Two Face and Black Foot
- Oregon Trail closed to civilian traffic

- Connecticut ratifies the Thirteenth Amendment to the Constutution abolishing slavery

- The Central Pacific Railroad is open to Auburn, California