public function installCountries($code = 'US')
    {
        $countryNames = Intl::getRegionBundle()->getCountryNames();

        if (!isset($countryNames[$code])) {
            throw new InvalidArgumentException("Invalid default country code '$code'.");
        }

        asort($countryNames);

        $this->generate(Country::class, $countryNames, $code);
    }