Since July 2004, the Palestinian Authority (PA) has faced its most serious internal challenge since it was established in 1994. A violent showdown in the Gaza Strip between competing nationalist factions-an "old guard" and a "young guard"-has threatened to destroy the PA and, with it, what little remains of domestic security and order after four years of uprising against Israel. The ongoing turmoil represents a critical danger, not just for Palestinian society and its dreams of a unified state, but also for Israel's plan to disengage unilaterally from Gaza-a plan the United States is counting on to revive the peace process and to regain much-needed credibility in the Middle East. Khalil Shikaki, mais no Foreign Affairs.01/09/2005 - 01/16/2005 01/30/2005 - 02/06/2005 02/13/2005 - 02/20/2005