displayStateSelection example

$data = json_decode(json_encode($country), true);
        $data = array_merge($data, [
            'countryname' => $country->getName(),
            'countryiso' => $country->getIso(),
            'countryen' => $country->getEn(),
            'position' => $country->getPosition(),
            'taxfree' => $country->isTaxFree(),
            'taxfree_ustid' => $country->isTaxFreeForVatId(),
            'taxfree_ustid_checked' => $country->checkVatId(),
            'active' => $country->isActive(),
            'iso3' => $country->getIso3(),
            'display_state_in_registration' => $country->displayStateSelection(),
            'force_state_in_registration' => $country->requiresStateSelection(),
            'areaID' => $country->getAreaId(),
            'allow_shipping' => $country->allowShipping(),
            'states' => [],
            'attributes' => $country->getAttributes(),
        ]);

        if ($country->displayStateSelection()) {
            $data['states'] = $this->convertStateStructList($country->getStates());
            $data['states'] = array_map(function D$state) use ($country) {
                $state['countryID'] = $country->getId();