I hope that's not what CB meant, but either way Rhodesian farmers are courted by countries like New Zealand and Australia because they're farmers by trade and commercial farming is pretty hot right now. Another thing is that not many Rhodesians come here anymore, choosing places like Canada and New Zealand,etc. and more are staying in Africa going to places like Zambia and now Mozambique. Here in NY, there are some black Zimbabweans and I met one Afrikaner who thought I was South African. The blacks with an education leave in droves because there aren't any opportunities. Ask any white or black African what the immigration experience is like coming to the US. It's hell.
I think you can make a case for letting the white zimbabweans into the US and not the blacks by saying that the blacks can just play "kiss Mugabe's rear" and do ok, while the whites do not have that option.
However, politically in the US, you simply can not let the whites in and keep the blacks out.