Add this snippet to the `functions.php` file of your theme to add a new country to the WooCommerce countries list.

    add_filter('woocommerce_states', 'sa_woocommerce_states');
    add_filter('woocommerce_countries_allowed_country_states','sa_woocommerce_state');
    
    function SA_woocommerce_states( $states ) {
    
        $states['ZA']['EC'] = __('Eastern Cape', 'woocommerce');
        return $states;
    }