Well if you can't travel then the mud can't either. Then nature will take hold and create more white people. The only reason why there's a mixing in the waters is because people can get shuffled around quite easily now. Shitty example but look at that full Prince Harry and his half breed wife she's half mud half white he's all German and inbred and they have a boy that's got red hair and pale skin. But he's such an idiot that he'll probably say he's mud on his birth certificate.b