How immunizations helped create America
David Leonhardt writes: The United States owes its existence as a nation partly to an immunization mandate. In 1777, smallpox was a big enough problem for the bedraggled American army that George Washington thought it could jeopardize the Revolution. An outbreak had already led to one American defeat, at the Battle of Quebec. To prevent more, Washington ordered immunizations — done quietly, so the British would not hear how many Americans were sick — for all troops who had not…