Country.php

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<?php
namespace Magento\Braintree\Helper;

use Magento\Directory\Model\ResourceModel\Country\CollectionFactory;
use Magento\Braintree\Model\Adminhtml\System\Config\Country as CountryConfig;

class Country
{
    private $collectionFactory;

    private $countryConfig;

    private $countries;

    public function __construct(CollectionFactory $factory, CountryConfig $countryConfig)
    {
        $this->collectionFactory = $factory;
        $this->countryConfig = $countryConfig;
    }

    public function getCountries()
    {
        if (!$this->countries) {
            $this->countries = $this->collectionFactory->create()
                ->addFieldToFilter('country_id', ['nin' => $this->countryConfig->getExcludedCountries()])
                ->loadData()
                ->toOptionArray(false);
        }
        return $this->countries;
    }
}