The answer is Sunni and Shia
The first basic technologically is widely considered steam engines, and then the factories. These greatly helped industrialization by making more products and such. It also helped make weapons and ammo for World War Two, which caused the great depression and these factory jobs were basically the only job that was available.
Around 4 years if we’re talking about the Final Solution
It led to a flowering of art, literature, and agriculture.
