The Greeks tried to unsuccessfully preserve the pure blood line of their culture while the Romans realized that to emulate this ideology would produce the downfall of the Roman Empire. Rome; therefore, instituted a policy whereby all natives of Italy were born Roman citizens. This allowed the entirety of Italy to unite under the Roman banner and into a nation based upon a common language, Latin, civil institutions and the weight of the Roman empire. There was a downside though, and that was mostly everyone became servants.
"Wheresoever the Roman conquers, he inhabits." wrote Seneca. Whether conquering was by compulsion or volition, as a Roman citizen you were forced to comply with the rules and laws of the government and at the same time, receiving her benefits.
One of the benefits, which the Roman government cherished and fostered to a great extent, was the Latin language. By the use of arms, Latin was spread to Africa, Spain, Great Britain and beyond. Along with the advent of the language came the 'dignity in letters', as evidenced by Lucan, Martial, Quintilian and others, all born on foreign soil. The Greeks thought better of themselves and were not inclined to adopt another language, especially one coming from the unpolished Romans. It was common, though, in Italy to find those in government, business and places of authority speaking both Latin and Greek.