DirectoryData.php

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<?php
namespace Magento\Checkout\CustomerData;

use Magento\Customer\CustomerData\SectionSourceInterface;

class DirectoryData implements SectionSourceInterface
{
    protected $directoryHelper;

    public function __construct(\Magento\Directory\Helper\Data $directoryHelper)
    {
        $this->directoryHelper = $directoryHelper;
    }

    public function getSectionData()
    {
        $output = [];
        $regionsData = $this->directoryHelper->getRegionData();
        foreach ($this->directoryHelper->getCountryCollection() as $code => $data) {
            $output[$code]['name'] = $data->getName();
            if (array_key_exists($code, $regionsData)) {
                foreach ($regionsData[$code] as $key => $region) {
                    $output[$code]['regions'][$key]['code'] = $region['code'];
                    $output[$code]['regions'][$key]['name'] = $region['name'];
                }
            }
        }
        return $output;
    }
}