The successors to Mohammed split into two major families, and contested to be his succors, launching war against each other, as persists to this very day. There were also sects within these two branches which further complicates the problems, rather similar to the splits in Christianity, though in very recent years, they have desisted (or forced to desist) from open conflict and violence.
Abbasid caliphate -- Baghdad Ummayyad Caliphate- Cordoba
No and they are still seprate countries
An unsuccessful German offensive was Operation Barbosa the invasion of the USSR.
he unified china and was a just ruler.
before
A Caliphist is a proponent of a caliphate, a unified Islamic government of the Muslim world.
Italy became a single, unified nation.
Engand & France were becoming nations unified under a single ruler.
There is no single unified theory that explains all correlated electron systems.
Unified action
Europe has yet to be unified under a single currency.
Abbasid Caliphate.
Rashidun Caliphate was created in 632.
Unified or central government
unified argument
Fascism is a political faction or party in a particular place. There is no single unified party so there is no single leader.
Abbasid caliphate -- Baghdad Ummayyad Caliphate- Cordoba