Mar 9 Charles Graham of NY granted first US patent for artificial teeth Mar 19 Boston, Massachusetts incorporated as a city Mar 22 NY Horticultural Society founded Mar 30 Congress combines East & West Florida into Florida Territory Mar 31 Massacre of the population of the Greek island of Chios by soldiers of the Ottoman Empire following a rebellion attempt, (later depicted by artist Eugène Delacroix) Share On Facebook Share On Twitter 1821 Historical Events by Year 1823