The history of racism in Oregon began before the territory even became a U.S. state. The topic of race was heavily discussed during the convention where the Oregon Constitution was written in 1857. In 1859, it became the only state to enter the Union with a black exclusion law, although there were many other states that had tried before, especially in the Midwest. The Willamette Valley was notorious for hosting white supremacist hate groups. Discrimination and segregation were common occurrences against people of African, Mexican, Hawaiian, and Asian descent. Portland, the largest city in the state, continues to have one of the largest proportions of white residents of major U.S. cities.