Historical urban/rural population for U.S. states

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I would think that urbanization would have been very high in the 70s and 80s as all the rural born baby boomers graduated high school and moved to "The Cities".  But the boomers also tended to move to areas that may have been considered rural during that time, but with rapid growth, were then reclassified as urban areas in the 1990s.

That's so weird, the opposite could be said in New Jersey.  All the city-born boomers were moving away, especially in the '70s and '80s.