I was just reading the description of the Orc race on World of Warcraft's website, and it's pretty clear that they represent blacks. Check it:

The savage, green-skinned Orcs are one of the most prolific races of Azeroth. They are commonly believed to be brutal and mindless, possessing no humanity or empathy for other races. Born on the hellish world of Draenor, the Orcs were brought into the kingdom of Stormwind through the dimensional gateway known as the Dark Portal and forced to wage war on the Humans. Although few are aware of their history, the Orcs once cultivated a noble, Shamanistic society on the world of Draenor. Tragically, the proud Orc clans were corrupted by the Burning Legion and used as pawns in the Legion's invasion of Azeroth. The Orcs managed to rebel, however, and they were ultimately able to help turn the tide against their demon masters. Led by the young Warchief, Thrall, the Orcs have reclaimed their strength and honor. Now, the Orcs stand ready to fight not for the sake of conquest, but for their right to survive in their adopted world.

Now change it around a bit to make it fit our world:

The savage, black-skinned Blacks are one of the most prolific races of Earth. They are commonly believed to be brutal and mindless, possessing no humanity or empathy for other races. Born on the hellish continent of Africa, the blacks were brought into the country of America through the water passage known as the Atlantic Ocean and forced to pick cotton for the Humans. Although few are aware of their history, the Blacks once cultivated a noble, Shamanistic society on the continent of Africa. Tragically, the proud Black clans were corrupted by the Jewish slave boat owners and used as pawns in the Jews' invasion of America. The Blacks managed to rebel, however, and they were ultimately able to help turn the tide against their White slave masters. Led by the young Warchief, Martin Luther King Jr., the Blacks have reclaimed their strength and honor. Now, the Blacks stand ready to fight not for the sake of conquest, but for their right to survive in their adopted world, unknowingly doing the Jew's bidding.