From Portland Mercury, December 11, 2013 - Oregon's First African Americans , by Joe Streckert:
"Vanport's construction was of the cheap and temporary kind (the locals called the prefabricated dwellings "cracker-box houses"), and for much of the 1940s, Portland's first sizable black population was separated from the town proper by economics, administration, and the river. The town was destroyed by a flood in 1948, and many refugees from the disaster settled in the Albina neighborhood. More than 100 years after initial settlement, Portland finally had an African American population of appreciable size. The influx of that population didn't come about, though, because Portland had liberalized or become more open. Portland's first large black neighborhood materialized because a force of nature destroyed an industrial ghetto."