Function reference
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          citypop
- Most populous city in each state (2010)
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          countypop
- Population estimates (2015), county level
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          countypov
- Poverty percentage estimates (2014), county level
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          .east_north_central
- East North Central census division
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          .east_south_central
- East South Central census division
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          .mid_atlantic
- Mid-Atlantic census division
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          .midwest_region
- Midwest census region
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          .mountain
- Mountain census division
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          .new_england
- New England census division
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          .north_central_region
- North-Central census region
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          .northeast_region
- Northeast census region
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          .pacific
- Pacific census division
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          .south_atlantic
- South Atlantic census division
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          .south_region
- South census region
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          .west_north_central
- West North Central census division
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          .west_region
- West census region
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          .west_south_central
- West South Central census division
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          earthquakes
- Earthquakes (2019)
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          fips()
- Retrieve FIPS code for either a US state or county
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          fips_info()
- Retrieve states or counties using FIPS codes
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          map_with_data()
- Join county or state level data to US map data
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          plot_usmap()
- Conveniently plot basic US map
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          statepop
- Population estimates (2015), state level
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          statepov
- Poverty percentage estimates (2014), state level
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          us_map()
- Retrieve US map data
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          usmapusmap-package
- usmap: US maps including Alaska and Hawaii
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          usmap_crs()
- usmap coordinate reference system
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          usmap_transform()
- Convert coordinate date frame to usmap projection