1804 ⟶ Lewis and Clark Expedition Begins Exploration of Western North America
Lewis and Clark Expedition in western U.S.
Year
1539
1804
1817
1842
1898
1945
🗺️ Hernando de Soto's Expedition into North America Begins
Hernando de Soto explores inland North America.⟶
ExplorationColonizationSpanish EmpireAge of ExplorationConquestIndigenous PeoplesColonialismEarly American History
United States🗺️ Lewis and Clark Expedition Begins Exploration of Western North America
Lewis and Clark Expedition in western U.S.⟶
ExplorationUnited States HistoryMappingIndigenous PeoplesTerritorial Expansion
United States⚔️ First Seminole War Begins
First Seminole War begins in Florida.⟶
WarfareMilitary ConflictUnited States HistoryFloridaNative American HistoryTerritorial ExpansionAndrew Jackson
United States🧪 First Use of Ether Anaesthesia
Anaesthesia used for the first time.⟶
MedicineSurgeryAnesthesiaMassachusettsMedical History
United States🌪️ J.J. O'Donnell Documents Tornado Sound Sequence
J. J. O'Donnell discovers and documents the order-of-sequence for the sound of an approaching tornado⟶
MeteorologyNatural DisasterWeatherObservationUnited States History
United States🧪 Willard Libby Begins Radiocarbon Dating Research
Willard Libby began his work on radiocarbon dating. He published his paper in 1946, a second paper in Science in 1947. Libby and James Arnold succeeded with the radiocarbon dating theory after results were published in Science in December 1949.⟶
ArchaeologyPhysicsChemistryHistory
United States