***YOUR FIRST LOOK*** Southwestern Pennsylvania played a key role in a war that led to the American Revolution in the 18th Century. And many of the key sites of the conflict are preserved and restored for future generations. A new WQED documentary provides insight to these historic battlefield sites. In the mid-1700s, the world's two greatest military powers, France and Great Britain, focused their attention on western Pennsylvania. The French were seeking Native American trade partners in a lan