Exclusive-Israeli settler confronts Palestinian American at his besieged West Bank home

By Pesha Magid, Ammar Awad and Sinan Abu Mayzer QUSRA, West Bank, Aug 18 (Reuters) - Palestinian American Loui Ridi raised a giant American flag over his West Bank home, hoping it might deter militant settlers besieging the property. But it wasn't enough to stop one of them from walking onto Ridi's landon Tuesday, during a tense face-off. Ridi arrived in Qusra late on Monday after traveling from the U.S., fearing he could lose the property to Jewish settlers who have encircled three…