And we need groups of locales for teams that are split across multiple locations; e.g.:

  new_date = add_workdays(
    workdays=1.5,
    start=datetime.now(),
    regions=["es", "mx", "nl", "us"],
  )

Don't forget about regional holidays, which might follow arbitrary borders that don't match any of the official subdivisions of the country. Or may even depend on the chosen faith of the worker