I am aware that not all of the population begs for emancipation.
You're assuming that Erinamese cities weren't industrialized. Where did you think that?
An influx to the degree you cited would create a system worse than hyper-dense population in irl China or India, and would result thus:
Influx → Rapid and Rushed construction of Projects → Inflation of Business Sectors (Anyone moved because of business reasons, which as you stated, is the main reason.)→ Extreme unemployment due to lay-offs or jobs not being available, failures of many businesses → Overextension of public goods (bread lines, soup kitchens) → Mass Starvation, Economic depression.
Ever think of that?
This is why I said that 10% would still be an influx.
Also, pretty sure it's a stretch to say a majority of UOU citizens knew Erinamese. How many people in America know Mandarin? Nowhere near a majority, but those who do relate to business.
Furthermore, does UOU stress arranged marriage or some stuff? I doubt this interracial marriage issue is even significant or relevant to mention, since it would not be a massive factor of political opinion.