When Oregon was granted statehood in 1859, it was the only state in the Union admitted with a constitution that forbade black people from living, working, or owning property there. It was illegal for black people even to move to the state until 1926.
https://gizmodo.com/oregon-was-founded-as-a-racist-utopia-1539567040
I knew about the constitution, but I wasn't aware of anything specific to 'Portland'.
I'm pretty sure that would just be redundant.