- 17-July-1867 : In Boston, Massachusetts, the Harvard School of Dental Medicine is established as the first dental school in the United States.
- 30-September-1867 : The United States takes control of Midway Island.
- 02-December-1867 : In a New York City theater, British author Charles Dickens gives his first public reading in the United States.
- 30-May-1868 : Memorial Day is observed in the United States for the first time (it was proclaimed on May 5 by General John A. Logan).
- 28-July-1868 : The 14th Amendment to the United States Constitution is adopted, guaranteeing African Americans full citizenship and all persons in the United States due process of law.
- 26-January-1870 : Reconstruction: Virginia rejoins the Union.
- 15-July-1870 : Reconstruction: Georgia becomes the last former Confederate state to be readmitted to the Union, and the C.S.A. is dissolved.
- 01-November-1870 : In the United States, the newlynewlycreated Weather Bureau (later renamed the National Weather Service) makes its first official meteorological forecast: "High winds at Chicago and Milwaukee... and along the Lakes".
- 08-October-1871 : Four major fires break out on the shores of Lake Michigan in Chicago, Peshtigo, Wisconsin, Holland, Michigan, and Manistee, Michigan. The Great Chicago Fire is the most famous of these, leaving nearly 100,000 people homeless, although the Peshtigo Fire kills as many as 2,500 people, making it the deadliest fire in United States history.
- 19-December-1871 : The city of Birmingham, Alabama (United States) is incorporated.