Get customer location

get_location.php

<?php

if( get_current_user_id() > 0 ) {  // if customer exists already
    $country = WC()->customer->get_billing_country();
} else { // if not-logged-in, need to use geolocation data
    // Get an instance of the WC_Geolocation object class
    $geo_instance  = new WC_Geolocation();
    // Get geolocated user geo data.
    $user_geodata = $geo_instance->geolocate_ip();
    // Get current user GeoIP Country
    $country = $user_geodata['country'];
}

if ( "US" == $country ) {
  // do US stuff here
} else {
  // assume they are in EU, because store only sells to US and EU countries
}