Housing Affordability & Sanctuary Cities

For your information: Wonder why housing is so challenging these days? https://www.pewresearch.org/fact-tank/2022/03/23/key-facts-about-housing-affordability-in-the-u-s/ What does being a "sanctuary city or state" mean? Washington State is a "sanctuary" state: https://ballotpedia.org/Sanctuary_jurisdiction_policies_by_state#Washington