Islam’s toxic schism

Here is an interesting article about the Sunni-Shia split. I would add that it is also a conflict between Arabs and Persians (and their subjects such as the Medes.

Embodied in the rivalry between Saudi Arabia and Iran, the Sunni-Shia divide is a schism that threatens to tear the Islamic world apart. Though its origins go back to the beginnings of Islam, its present toxicity is a recent development.