Lebanon was established in 1920 from remnants of the Ottoman Empire. Its mixed Christian and Muslim population generally lived peacefully under a weak central government until the 1970s. Israel invaded in 1978 to challenge the Palestine Liberation Organizations (PLO) influence in Lebanon and to stop PLO raids on Israel. During the 1980s Lebanon became the scene of intense fighting between PLO, Syrian, and Israeli forces, as well as indigenous Christian and Muslim factions. Terrorist bombings and the taking of foreign nationals (including American citizens) as hostages became common events. By 1992, Syria had emerged as the dominant influence in Lebanon. Democratic elections were held in the mid-1990s.