Loudoun County, Virginia: 2012 to 2020

Loudoun County, Virginia encompasses the northernmost portion of the state, on the outskirts of the Washington, DC metro area.  This pair of maps from José Manrique (@JoseManrique93) shows President Joe Biden improving on President Barack Obama's re-election numbers by ten points, and President Donald Trump under-performing now-Senator Mitt Romney by even more than that.  They say:

The more suburban part of Loudoun County, VA (i.e. the precincts to the southeast) was already voting Democratic back in 2012, but the margins Biden got in that area were just overwhelming. Trump received less than 40% in almost every precinct of said area in 2020. pic.twitter.com/2ksZPypybS

— José Manrique (@JoseManrique93) May 17, 2021

This populous county swinging toward Democrats is one of a few reasons why Virginia is trending blue.  I personally find it interesting how Republican support has noticeably collapsed near the geographical center of the county.

Most Recent Year Each State Elected a Democrat or a Republican to the Senate

Twitter user @realFrosst shows us that Kansas hasn't elected a Democrat to the US Senate since 1932(!), while Hawai'i has the longest streak of not electing any Republican senators, going back to 1970.

If you compare the same state across the two maps, you can get a sense of how competitive the state is in recent history.

Maine is notable as a technicality, due to independent Senator Angus King, who caucuses with the Democrats.

Most Recent Year Each State Elected a Democrat to the Senate

Most Recent Year Each State Elected a Republican to the Senate

Building Locations in the USA Compared to 2020 Presidential Margins

This beautiful set of maps from Twitter user @Akko2021 shows how population density correlates with political outcomes.  Here's what they had to say:

#ElectionTwitter The urban/rural divide is one of the prevalent divides in the United States. One way to measure it is by looking at a map of buildings. Comparing the over 130 million buildings to the 2020 results, the map not only looks beautiful but the similarities are clear. pic.twitter.com/2eN4gdvJN0

— Akko (@Akko2021) May 15, 2021

  And here are the maps (definitely click open the full-size versions, they're awesome!):