| Duke of Wellington, who made Napoleon very unhappy. | |
| Mary Harris Jones (Mother Jones), hellraiser | |
| May Day | |
| 1st adhesive postage stamps (English 'Penny Blacks') issued. | |
| John Geary becomes 1st mayor of City of San Francisco. | |
| 1st school for the deaf founded. | |
| Folies-Bergere opens in Paris. | |
| Construction begins in Chicago on the 1st skyscraper. | |
| US Quarantine Station opens on Angel Island. | |
| Lei Day begun (a Hawaiian celebration) | |
By Scott Labrecque version 9.4.0.0