Changes in version 1.0.0.9000                      

                 Changes in version 1.0.0 (2026-05-14)                  

Breaking changes

  - states split into two tibbles: state_ids (naming and coding systems)
    and state_geo (geographic and classificatory properties).

  - facts renamed to state_facts; state.x19 removed.

  - Puerto Rico removed from all state_* objects. It is now included in
    territory and the territory_* vectors alongside AS, GU, MP, UM, and
    VI. All state_* objects now cover exactly 51 rows (50 states + DC).

  - state.abb, state.area, state.center, state.division, state.name, and
    state.region dot-named vectors replaced with state_abbs,
    state_areas, state_centers, state_divisions, state_names, and
    state_regions.

  - zip.code, zip.center, city.name, and county.name renamed to
    zip_codes, zip_centers, city_names, and county_names.

New data

  - state_capitals: capital city name, coordinates (TIGER 2020 internal
    points), and population (2020 Decennial Census) for the 50 states
    and DC.

  - state_geo gains peak_elev (state high point in feet, USGS) and adds
    DC.

Updated data

  - state_facts population updated to 2020 Decennial Census (was 2010
    ACS).

  - state_facts income updated to 2022 ACS 1-year per capita income
    (was 2019 median household income).

  - state_facts Electoral College votes updated to 2020 Census
    reapportionment (applies 2022–2032).

  - state_facts murder rate updated to 2022 FBI NIBRS homicide rate per
    100,000 via the Crime Data Explorer API (was 2018 UCR).

  - state_facts education updated to 2022 ACS 1-year; college now stored
    as a proportion (0–1) rather than a percentage.

  - state_facts heat (1981–2010 cooling degree days, dead FTP source)
    replaced by frost: mean days per year with minimum temperature below
    freezing, from the NCEI 1991–2020 Climate Normals.

  - state_facts life expectancy updated to 2021 NCHS state life tables
    via CDC (was 2017–18 data from a Wikipedia scrape).

  - counties source updated from archived FCC file to Census TIGER 2020
    national county reference file. Row count 3,232 → 3,235.

  - state_ids gains icp (IPUMS STATEICP codes) and ap (AP style
    abbreviations) columns.

Other changes

  - sp and rgdal dependencies removed; spatial operations use sf and
    tigris throughout.

  - state_capitals coordinates and population now sourced from the
    Census API rather than hardcoded.

                 Changes in version 0.1.3 (2025-09-02)                  

  - Fix logo URL in README

                 Changes in version 0.1.2 (2024-03-11)                  

  - Update maintainer email, website URL, and GitHub URL.

                        Changes in version 0.1.1                        

  - Add state_convert() helper function.
  - Add Electoral College votes to facts.
  - Remove the invalid negative degree days in the mean.
  - Rename the bach column to college and remove the high column.

                 Changes in version 0.1.0 (2020-02-23)                  

  - Rename info data to facts.
  - Separate territories from states to territory, etc (for now).

                        Changes in version 0.0.9                        

  - Finish the info data set:
      - Find degree days for Washington, DC.
      - Use state names instead of abbreviations.
      - Remove outdated literacy rates.
      - Add admission date (age in matrix).
      - Use https://data.census.gov sources.
      - Save .zip and .xlsx data sources.

                        Changes in version 0.0.8                        

  - Add the data from the archived zipcode package.
  - Export the columns from the zipcodes data frame as zip.* vectors.

                        Changes in version 0.0.7                        

  - Add the synthetic people data set from PEW Research.

                        Changes in version 0.0.6                        

  - Replace geocodes data with census sources.
  - Combine state info into single table.
  - Delete unfinished data.

                        Changes in version 0.0.4                        

  - Save state_centers tibble from Wikipedia.
  - Overwrite state.center list with territories.
  - Update README.md with newest object differences.

                        Changes in version 0.0.3                        

  - Improve draft objects and tibbles.
  - Add overall states tibble.

                        Changes in version 0.0.2                        

  - Overwrite the base state.* objects.
  - Add draft versions of most relational tibbles:

                        Changes in version 0.0.1                        

  - Rename package to usa
  - Create fips, regions, divisions, and populations tibbles.

                     Changes in version 0.0.0.9000                      

  - Added a NEWS.md file to track changes to the package.