Yes, there are ethnic differences, but throughout all of history there have/were slaves to the RICH and Corporations. Go back to the Roman days, The early Religious wars etc.

Most immigrants to America were used and abused by those, mostly RICH people who immigrated here first and those who had the most money and power. The Irish, Italians, Jews, Polish, Asians, Franco-Americans from Canada etc., etc.

That many/most RICH people are white only matters in America. One can go to the middle east and see how the Rich and Powerful in each of those countries treat the poor members of their own ethnicity like slaves and peons. Look at what's going on in many African nations. The RICH blacks controling and killing the poor.
Walk into any large corporations and compare those at the top to those on the bottom and you'll see the same slave-dynamic at work.