People in a lot of countries are annoyed about foreigners stealing jobs from the local citizens. It is however interesting to note that these locals are not angry about all foreigners in their country. They are only riled up about some foreigners. To be more specific, they are annoyed about non-caucasian foreigners who do not look like them in skin color.
So such countries resort to tactics specifically designed to keep such foreigners from succeeding. That involves, tactics like: job promotions based on whether you belong to the above mentioned group or not.
I do not understand the rationale behind the human preoccupation with skin color. It seems so arbitrary. Why not hair color or eye color?