If you like diversity, Portland is not for you. The metro area is 93 percent white, with a large population of Asians. There is hardly a dark face to be seen. The black population is only 1.7 percent. The root cause of that may be that after the Civil War, Oregon passed anti-immigration laws and even made those laws part of its constitution. For decades, blacks, for example, could own no real estate of any kind under Oregon law.