Probably the most substantive change that the Rightly-Guided Caliphs made were the mechanics they implemented to govern their much larger empire. This included the creation of regional governates and the inclusion of former elites from the conquered regions to lead and guide the state's bureaucracy.
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PERSIA
Umayyads
Madinah
The Umayyads and the Abbasids.
The rightly guided caliphs
The Umayyad Caliphate came after the four Rightly-Guided Caliphs.
There were FOUR Rightly-Guided Caliphs after Muhammad's death (Abu Bakr, Omar, Othman, and Ali). After Ali was assassinated, the Umayyads swept into power, ending the age of the Rightly-Guided Caliphs and beginning a more imperial form of government.
They used Muhammad's actions as guides to leadership.
Hazrat Ali RAU was the last Rightly Guided Caliph. Hazrat Umar bin Abdul Aziz is also considered a Rightly Guided Caliph as he also rules justly.
It depends on whether you consider western Anatolia to be part of Southwest Asia. The Rightly-Guided Caliphs conquered all other regions of Southwest Asia, including Arabia, Egypt, the Levant, Mesopotamia, Persia, and eastern Anatolia. However, Muslims under the Rightly-Guided Caliphs left western Anatolia under Byzantine control.
There were FOUR Rightly-Guided Caliphs after Muhammad's death (Abu Bakr, Omar, Othman, and Ali). After Ali was assassinated, the Umayyads swept into power, ending the age of the Rightly-Guided Caliphs and beginning a more imperial form of government.