Many Chinese employers prefer native speakers of English from the US.According to what I've been told,that is because the USA is the richest country in the world,as well as being one of the biggest.Hence the best one to do business with.In Taiwan the preference is also for Americans as FT's of English,probably mainly for the same reasons.
But when it comes to African Americans,they often find it dificult to get jobs because of discrimination against coloured people.You'll sometimes see job ads specifying that white native speakers of English are required.Of course,that's a bad thing!But usually when you don't,it still applies.