Simply put, the British, French, and Russians stuck their noses into the region and made nations based upon their ideals – NOT the true status of the peoples.
The turmoil in Lebanon, Syria and Iraq can rightly find its roots in the Sykes-Picot agreement which Britain, France and Russia signed in 1916
And it actually spreads everywhere, not just those three countries.
Read the full story @ The Deal of the Century: Redrawing the Map of the Middle East