Arabization or Arabisation ( ) describes either a conquest of a non-Arab area and migration of Arab settlers into the new domain or a growing Arab influence on non-Arab populations, causing a gradual adoption of Arabic language and/or incorporation of Arab culture and Arab identity. It was most prominently achieved during the 7th century Arabian Muslim conquests, in which Arab armies were followed by massive tribal migration into the Muslim-occupied territories across Middle East and North Africa, spreading the Arabic culture, language, and in some cases Arab identity upon conquered nations. Arabian Muslims, as opposed to Arab Christians, brought the religion of Islam to the lands they conquered. The result: some elements of Arabian origin combined in various forms and degrees with elements taken from conquered civilizations and ultimately denominated "Arab". The Arabization continued also in modern times, being aggressively carried by the Ba'athist regimes of Iraq and Syria, Sudan, Mauritania, Algeria and Libya, enforcing policies of expanding colonial Arab settlements, expulsion of non-Arab minorities and in some cases enforcement of Arab identity and culture upon non-Arab populations. Some also claim that the aggressive persecution of non-Arab minorities by the terror group Islamic State of Iraq and the Levant is Arabization.