- May 13 Republic of Ecuador is founded, with Juan Jose Flores as president
- May 28 US Congress authorizes native Indian to be removed from all states to the western prairie
- Jun 12 Beginning of the French colonization of Algeria: 34,000 French soldiers land 27 kilometers west of Algiers, at Sidi Ferruch
- Aug 28 1st American built locomotive, "Tom Thumb" races a horse-drawn car from Stockton and Stokes stagecoach company from Baltimore to Ellicott Mills. Let history record that due to mechanical problems the horse won!
"Mary Had A Little Lamb" by Sarah Josepha Hale is first published by Boston firm Marsh, Capen & Lyon
On May 24, 1830