The overwhelming majority of tax revenues from income tax are derived from older, white Americans. Go ahead and replace them, and suffer the consequences. America will be like Brazil within my lifetime, thanks to the idiotic white liberals who decided that achieving power was worth squandering their children's futures. By the time the USA reaches 400 million people, there will be no middle class, as the corporate world managed to import white collar labor from India and China, squeezing out those who've held those positions, and forcing them into lower paying work.
You liberals and progressives are so clueless, and don't realize that your melting pot utopian dream is paid for by corporations seeking a more globalized work force, which spells disaster for the American people.
Yeah, I'm pretty sure that George Washington and the founding fathers didn't work their asses off so that we could "surf the tsunami", i.e, compete with people from foreign backgrounds for work in our own country, in order to avoid abject poverty.
Liberalism is unsustainable in the USA, and will be rejected and replaced by the ancestors of those who fought in the Revolution.