Rome’s illegal alien problem came to a head after 146 BC, Randall Collins says, when Rome emerged as the hegemon, the dominant state in Mediterranean world:
Partisan factions developed in the Roman elite itself; conservative defenders of the old Republic, but also a “democratic” party in favor of redistributing public land, handouts to the poor, and widening the franchise. These were not merely idealists; they had a strong practical concern, that the basis of the old Roman army — self-sufficient small farmers — was disappearing and needed to be revived. This the reformers never did achieve; but army reform and franchise reform tended to go in tandem. Leading liberals often came from the ranks of the most successful generals, like Marius and Caesar. The first famous reformers were the Gracchus brothers, who ran for the highest office under proposals to extend the Roman franchise to at least some of the nearby Italian allies. Tiberius Gracchus was killed by a crowd of angry senators in 132 BC, as was his brother Gaius ten years later.
The younger Gracchus did succeed in passing a law instituting the dole: the state undertook to import grain to sell to citizens of the capital below market prices. Handouts by the liberal state became permanent, no conservatives being strong enough to brave the crowds’ demand for the staple of food. Rome created the early welfare state, in effect a massive food stamp program. Poor citizens were never supported to the level of the prosperous classes but their numbers as a political force kept them going for centuries on the public dole. Supplying “bread and circuses” became the path to popularity by subsequent Roman politicians. The elite undertook to keep the people entertained by sports and other spectacles, in stadiums and colosseums that Americans imitate today.
Although franchise reform was defeated, one political crisis after another kept opening loopholes for more resident aliens to become citizens. Around 100 BC, Marius reformed the army; eliminating the old militia in which all land-owning citizens were called each year, and putting in its place a standing army recruited from the impoverished proletariat. Soldiers were now long-term volunteers, supported by regular pay, and rewarded by allotment of lands when their 16-year tour was up. Such armies were much more expensive, and generals had to be capitalists in their own right to raise an army, and aggressive conquerors of new territory in order to pay for it. Marius’ nephew, Julius Caesar, would become the great master of this path to success — a liberal reformer who made an alliance between some of the richest capitalists and the urban poor.
In the meantime, full-scale war broke out over the question of the franchise. In 91 BC, another liberal reformer, Livius Drusus, ran on a program to give the Roman franchise to all Italians. He was murdered before the vote, giving rise to the Social War that went on from 91–88 BC. It was so called because the Latin word socii meant allies — the war of the long-suffering second-class non-citizens. This time the aliens had strong support, in the liberal faction of the Roman elite, and their new-style popular generals. The Social War dragged on for three years, fought in communities all over Italy. It ended in a compromise, since foreign provinces were taking the opportunity to revolt; peace terms offered Roman citizenship to all those who laid down their arms. Another bloody civil war went on down to 83 BC between the conservative general Sulla and the liberal Marius; the democrats were defeated but in the aftermath the franchise was conceded throughout Italy. Both sides had come to depend too much upon non-citizen communities for soldiers and support; and so many Romans from high ranking families were killed and expropriated in partisan purges that it brought considerable opportunities for upward mobility.
With Julius Caesar, the pattern was repeated on a larger scale, this time outside of Italy. Caesar recruited large numbers of Gauls, Spaniards and others into his legions; and during his conquests he bargained with friendly tribes by offering some form of citizenship. By the time of his assassination in 44 BC, Caesar was planning to erase the distinction between Italy and the foreign provinces. When peace was reestablished in the reign of Augustus Caesar in 27 BC, all this came to pass. Henceforward, Senators were appointed from all over the Empire, irrespective of origin. The highest offices were open to any citizen, without distinction of ethnicity or geography (of course there were other criteria, such as being rich, and above all a supporter of the ruling faction); emperors themselves came from all parts of Italy and the distant provinces.