April 21 – Texas Revolution: Battle of San Jacinto – Republic of Texas forces under Sam Houston defeat troops under Mexican General Antonio López de Santa Anna. (Santa Anna and hundreds of his troops are taken prisoner along the San Jacinto River the next day.)
December 14 – The Toledo War, the mostly bloodless boundary dispute between Ohio and the adjoining Michigan Territory, is unofficially ended by a resolution passed by the controversial "Frostbitten Convention".