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In page Phoenix, Arizona:

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Phoenix's population has historically been predominantly white.[citation needed] From 1890 to 1970, over 90% of the citizens were white.[citation needed] In recent years, this percentage has dropped, reaching 65% in 2010. However, a large part of this decrease can be attributed to new guidelines put out by the U.S. Census Bureau in 1980, when a question regarding Hispanic origin was added to the census questionnaire. This has led to an increasing tendency for some groups to no longer self-identify as white, and instead categorize themselves as "other races".[1]