When media color code the map of the US by which party wins a state or congressional district with red being for Republicans and blue for Democrats, they tend to do it by state (for statewide results as in the electoral college) or by district (for congressional seats). The resulting map tends to be largely blue on the east and west coasts with vast swathes of red in the middle, giving the impression that the country is dominated by Republicans. Conservatives like to use such maps to bolster their claim that the US is largely a right-wing conservative country.
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