30: Lewis and Clark begin their expedition into the western wilderness.
29: James Monroe announces a new policy forbidding European interference in the Americas and declaring neutrality in European conflicts; it will be known as the Monroe Doctrine.
28: President John F. Kennedy is assassinated in Dallas, Texas. Vice President Lyndon Johnson assumes the presidency. The assassin, 24-year-old Lee Harvey Oswald, is killed two days later by nightclub owner Jack Ruby. ft. author of Case Closed: Lee Harvey Oswald and the Assassination of JFK, Gerald Posner.
27: The Civil War: The bloodiest day in American history (over 22,000 casualties) ends with a Union victory in the Battle of Antietam.
26: Valley Forge – Washington’s troops struggle through a brutal winter in Pennsylvania, but emerge reinvigorated with training exercises led by Friedrich Wilhelm von Steuben ft. Executive Director of the George Washington Presidential Library at Mount Vernon, Dr. Lindsay Chervinsky.
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