I know very little about Muslim theology. I know they want people to convert to Islam.
But we talk about “Londonistan” due to the growing Muslim population in London, for example. Is colonization of countries a key part of their actions to spread Islam???
Think of the Sofia in Constantinople changing hands between Christians and Muslims over the centuries. Muslims organize under a Caliphate, which can appear multinational. Different customs, languages, subservient to Islam.
I am not sure if a Caliphate can be a combination of Sunni and Shiite after the target country has acquiesced to Islam.