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Lebanon's devastating civil war, in which Christians, Muslims, and Druze (a Muslim sect) slaughtered one another relentlessly, ended following the 1989 Taif Agreement, which gave Syria limited rule over the wrecked country. The agreement called for Syria to withdraw its troops and hand power back to a reconstructed Lebanese government after two years.
Yet today, 20,000 Syrian soldiers remain in Lebanon, and Syria's grip on Lebanese politics is stronger than ever. It is an invisible occupation, in which Lebanon's leaders must seek Damascus's approval of their policies, and Syrian plainclothes agents roam back streets, ears cocked for political dissent. Syria also supports the terrorist Islamic group Hezbollah and allows it run of the Lebanese-Israeli border.
Syria says its presence is legitimized by a bilateral arrangement with Beirut and is necessary to keep peace among Lebanon's religious factions. And to some Lebanese, Syria's stabilizing influence is a welcome contrast from the chaos of the 1980s.
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http://www.csmonitor.com/2004/0108/p10s01-wome.htm