The inhabited lands themselves subsequently fell into two main categories:
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Regions where the Arabic tongue gained the upper hand among their people, so that the common folk know no other language—or know it alongside another—despite the linguistic errors that have crept into their speech. This applies to most of Greater Syria, Iraq, Egypt, al-Andalus, and the like; and I suspect that in earlier times the lands of Persia and Khurasan were similar.
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Regions in which a non-Arab language is widespread or even predominant, such as the territories of the Turks, Khurasan, Armenia, Azerbaijan, and so forth.
Thus, these areas may be classified as originally Arab, as having become Arab through migration, or as non-Arab.
Lineages likewise fall into three divisions:
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People of Arab descent who still retain Arabic—both language and homeland, or the language without the homeland, or the homeland without the language.
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People of Arab stock—indeed of the line of Banū Hāshim—whose language and homeland, or one of the two, has become non-Arab.
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People of unknown origin: it is not known whether their ancestry is Arab or non-Arab