The document discusses Israel's 1982 invasion of Lebanon and the civil war that preceded it from 1975 to 1976. The civil war was a result of changing political dynamics in Lebanon that undercut the authority of older ruling families. It pitted the Lebanese front, which supported the status quo, against the Lebanese National Movement, a reformist coalition backed by Palestinian allies who wanted to reduce political monopolies and transform Lebanon into a democracy. Israel's invasion further disrupted Lebanon's political situation.