On this day in history, September 21, 1780, Benedict Arnold betrays cause of American independence September 21, 2024, 03:30:36 AM On this day in history, September 21, 1780, Benedict Arnold betrays cause of American independence[html]American officer Benedict Arnold met in secret with British Major John Andre on Sept. 21, 1780, with a plot to trade the American stronghold at West Point for cash amid the American Revolution.[/html]Source: On this day in history, September 21, 1780, Benedict Arnold betrays cause of American independence (http://ht**://www.foxnews.c**/lifestyle/this-day-history-sept-21-1780-benedict-arnold-betrays-cause-american-independence) Quote Selected