Democrats' urban machine

Look at the clientele of the urban areas.

Urban areas typically draw people from many different backgrounds. I think being around people from different backgrounds everyday, generally makes people a little more liberal. Even Republicans in urban areas are generally more liberal than rural republicans.

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How have the democrats been so successful in establishing their 'machine' in so many (most) American cities?

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It's pretty simply black voters. Blacks vote democrat at like a 85-90% clip and outside of the south are mostly concentrated in urban areas.

Also 75-80% of big cities have a well regarded University which leads to more liberal/democrat voters.