How to show only US country in checkout dropdown and admin orders side display all countries

Question

How to show US country only in magento2 checkout frontend and admin orders side show the all countries

How to restrict all countries except US country in magento2 checkout.

Answer 1

Di.xml

<type name="Magento\Checkout\Block\Checkout\DirectoryDataProcessor">
    <plugin name="sr_checkout_country_list_fix"
            type="VendorName\Checkout\Plugin\Block\DirectoryDataProcessor" sortOrder="1"/>
</type>

Now app/code/VendorName/Checkout/Plugin/Block/DirectoryDataProcessor.php

<?php

namespace VendorName\Checkout\Plugin\Block;

use Magento\Checkout\Block\Checkout\DirectoryDataProcessor as BaseDirectoryDataProcessor;

class DirectoryDataProcessor
{
    /**
     * @param BaseDirectoryDataProcessor $subject
     * @param $jsLayout
     * @return mixed
     */
    public function afterProcess(
        BaseDirectoryDataProcessor $subject,
        $jsLayout
    ) {
        $finalCountries = [];
        $finalCountries[] = [
            'value' => 'US',
            'label' => 'United States',
            'is_region_visible' => 1,
            'is_default' => 1
        ];

        $jsLayout['components']['checkoutProvider']['dictionaries']['country_id'] = $finalCountries;
        return $jsLayout;
    }
}