Lakota, Northern Cheyenne and Arapaho warriors defeat the US 7th Cavalry Regiment led by George Armstrong Custer.
Three days after receiving his patent, Alexander Graham Bell makes the first successful telephone call to his assistant Thomas Watson.
Thomas Edison's Menlo Park laboratory produces a carbon-filament incandescent lamp long-lasting enough for practical use.
The golden spike is driven at Promontory Summit, Utah, completing the first transcontinental railroad in the United States.
The United States signs a treaty to buy Alaska from the Russian Empire for $7.2 million.
The colonies of Canada, Nova Scotia and New Brunswick unite as the Dominion of Canada, the beginning of the modern Canadian state.
General Robert E. Lee surrenders to General Ulysses S. Grant, effectively ending the American Civil War.