Ethnic divisions were fairly strong, with no statistically dominant group, creating a complex society.
"As a consequence of Rome's entry into the East and her active interest in the cities, urban society became somewhat more complex than it had been even during the Hellenistic age. For a very long time groups of foreigners had gathered in each city: merchants and artisans following the armies or in search of better markets or better access to transportation, persons enslaved and displaced by war or piracy and now set free, political exiles, soldiers of fortune. These non-citizen residents, or metics, often retained some sense of ethnic identity by establishing local cults of their native gods or by forming a voluntary association, which also had at least the trappings of religion." [Meeks, The First Urban Christians(Yale):13]
"When a stranger arrived in a city, then, it is taken for granted that he knew, or could easily learn, where to find immigrants and temporary residents from his own country or ethnos and practitioners of his own trade. Nothing could be more natural, for these were the two most important factors in the formation and identification of neighborhoods.." [Meeks, The First Urban Christians (Yale) :29] (He gives examples of Jewish quarters, linen-weavers quarters, etc.)
"By the first century CE non-Romans and their descendants made up a large part, if not the majority, of the common people of the city [Rome], a large population of free resident aliens, and the entire slave class." [Donfried/Richardson, Judaism and Christianity in First-Century Rome (Eerdmans):129]
"Roman tenement buildings were usually the only places open to them [new immigrants to Rome]. Persons of the same nationality tended to congregate in individual apartment buildings as new arrivals sought the companionship of established compatriots." [Donfried/Richardson, Judaism and Christianity in First-Century Rome (Eerdmans):131]
"There were eighteen identifiable ethnic quarters within Antioch" [Stark, The Rise of Christianity (Princeton):158]
"What does seem clear is that the social integration of Greco-Roman cities was severely disrupted by the durability of internal ethnic divisions, which typically took the form of distinctive ethnic precincts. Ethnic diversity and a constant influx of newcomers will tend to undercut social integration, thus exposing residents to a variety of harmful consequences, including high rates of deviance and disorder. Indeed, this is the major reason why Greco-Roman cities were so prone to riots." [Stark, The Rise of Christianity (Princeton):158]
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How did the various ethnic groups shape the Roman Empire?
Compare the old times with the evolution of the modern United States.