PoliticalLegal & treatiesCulturalSpace
- 1776Independence4 July 1776 (declared independence from Great Britain); 3 September 1783 (recognized by Great Britain)CIA World Factbook
- 1958First space object launchedExplorer IGCAT
- 1978First UNESCO World Heritage siteMesa Verde National ParkUNESCO World Heritage
- 1988Ratified the Genocide ConventionUN Treaty Collection
- 1992Ratified the ICCPR (civil & political rights)UN Treaty Collection
- 2023Most recent World Heritage inscriptionHopewell Ceremonial EarthworksUNESCO World Heritage
- 2024Most recent legislative election2024-11-05IPU Parline
- 2026Most recent space launchGCAT
