If you have statistics showing that US green cards are mostly awarded to whites, despite going to mostly non-white-countries, please share them. It would certainly go against the general trend of US immigration, which is predominantly non-white, and has been since 1965.
I'm honestly not sure. Until now, I had no idea that was a special type of green card. The second-to-last chart in that article mentions employment as an admission category, so maybe? Better sources are welcome.
In either case, pretty much every source I'm aware of shows immigration to the US as predominantly non-white, so I'd like to see the claim that it appeases southern segregationists backed up by some evidence.
How many whites vs blacks get visas in South African historically?