Iran, a Shia country, is getting more powerful, which Saudi Arabia (probably rightly) sees as a threat to its regional dominance.
In general, Shias and Sunnis got along quite peacefully until a few decades ago.
In general, Shias and Sunnis got along quite peacefully until a few decades ago.
But I mean, they're all Moslems, right? It has to do with who the rightful heir to Mohammed is. Is it Ali, or Abu Bakr? The answer to that question thus says which side of the interpretation of "Shia" or "Sunni" is.
Long story short, it's not resolvable without a great deal of violence. Disagreements about succession are hardly ever peaceful.
[0]https://www.theguardian.com/world/2017/sep/14/saudi-crown-pr...