America http://redriverradio.org en History Matters: Defining the American frontier http://redriverradio.org/post/history-matters-defining-american-frontier <p>Commentator Gary Joiner&nbsp;explores the reach&nbsp;of the American frontier and defines&nbsp;what a frontier&nbsp;is.</p> Tue, 20 Dec 2011 13:35:00 +0000 Gary Joiner, Ph.D. 3908 at http://redriverradio.org History Matters: Defining the American frontier