Interesting visual from 538.com
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It's funny - the idea that the City of Westminster would be the most staunchly Labour constituency in the UK is hilarious.
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Klaus, DC is the most heavily african American of any voting district. It’s heavy african American population dates back to the founding when 25% of the city were enslaved people. After the civil war many freedmen flocked there too. By 1900 it had the highest percentage of blacks of any city in the US.
As for Nebraska and Maine, unlike all the other states, they don’t vote all of their electoral votes for a single candidate. They give two votes to the popular vote winner statewide, and give each congressional district a single vote. (Note that that formula 2 senators + x congressmen is how the number of electoral votes per state are decided to begin with)
One of the NE regions, Omaha and suburbs, is in play for Biden. Obama won it at least once. In Maine, one is more rural and will go for Trump, while the coastal region will go Biden.
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NE1, NE2, and NE3 refer to the three "congressional districts" in the state of Nebraska.
Nebraska is a state that allows the "splitting" of electoral college votes, hence it's broken down into "districts" in the graphics @jon-nyc posted.
See https://www.270towin.com/content/split-electoral-votes-maine-and-nebraska/(Otherwise, "NE" as an acronym in the context of North American geography usually refers to the New England region.)