- Mar 3 Congress authorizes the 1st steel vessels in US navy
- Mar 16 Susan Hayhurst becomes 1st US woman graduate of a pharmacy college
- Mar 19 Jan Matzeliger invents first machine to manufacture entire shoes
- Mar 20 Unity treaty of Paris signed: protects industrial property
- Mar 24 1st telephone call between NY & Chicago
- Mar 31 Utrecht begins water pipe system