Battle of Cerro Corá
Mar 1 War of the Triple Alliance finally ends with the Battle of Cerro Corá and the death of Paraguayan Dictator Francisco Solano López after over 5 years of bloodshed between Paraguay and Argentina, Brazil and Uruguay
Thomas Scott
Mar 4 On command of Louis Riel, Thomas Scott is executed by a firing squad. Riel rejects all appeals and requests to intervene in an attempt to demonstrate to the Canadian government that the Métis must be taken seriously
Revels 1st Senate Speech
Mar 16 Hiram R. Revels makes 1st official speech by an African American in the US Senate
- Mar 17 Mass legislature authorizes incorporation of Wellesley Female Seminary
- Mar 18 1st US National Wildlife Preserve (Lake Meritt in Oakland California)
- Mar 18 Antonio Carlos Gomes' "Il Guarany" premieres at La Scala Opera House in Milan, Italy, 1st Brazilian opera successful outside Brazil
- Mar 19 Antônio Carlos Gomes' opera "Il Guarany" premieres at Teatro La Scala in Milan, Italy
- Mar 22 Ohio State University is established as the Ohio Agricultural and Mechanical College, a public land grant college, in Columbus. Ohio
- Mar 30 15th Amendment to the US constitution is adopted, guarantees right to vote regardless of race
- Mar 30 Florida territorial government established
- Mar 30 Texas becomes last confederate state readmitted to Union
- Mar 31 Thomas Mundy Peterson of Perth Amboy, New Jersey is the first African American to vote in the US under provisions of the 15th Amendment to the Constitution, in a local election on town's charter [1]