I've added some WooCommerce checkout form fields to the registration form, since my site requires customer to provide their billing address during registration.

// Custom function to display the Billing Address form to registration page
function rsc_add_billing_form_to_registration(){
    global $woocommerce;
    $checkout = $woocommerce->checkout();
    <?php foreach ( $checkout->get_checkout_fields( 'billing' ) as $key => $field ) : ?>

        <?php if ( $key != 'billing_email' && $key != 'billing_phone' && $key != 'billing_tax_exempt_id' && $key != 'billing_verify_email' &&
        $key != 'billing_phone_ext'  ) { 
            woocommerce_form_field( $key, $field, $checkout->get_value( $key ) );
        } ?>

    <?php endforeach; 

The State/ZIP fields DO change when the form is submitted but not with some kind of AJAX (I assume) call the way they do on the checkout form.

Is there a hook I need to add to have the address fields update when the customer changes their country the same way it works in checkout?

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