Disclaimer

This will work for stores on Miva Version 9.0005 - 9.0006. Note that this will require making changes to files on the server. Make sure you make a backup of any files you will be altering.These edits are low-risk but if you feel uncomfortable with making these changes then we advise you to seek help from a developer. 

Issue

When one country is selected in the Countries tab under store settings. The State/Province drop down reverts to a text field.

Instructions

domainname.com / httpdocs / mm5 / themes / levels / js / scripts.js

Under jsOCST in scripts.js, add the following:

$(window).on('load', function () {
if ($('#ShipCountry:disabled')) {
$('#ShipCountry').parent().removeClass('no-data');
}
if ($('#BillCountry:disabled')) {
$('#BillCountry').parent().removeClass('no-data');
}
});

Add the code above below...

// ---- Google Address Autocomplete ---- //

// cornerstoneUX.sharedFunctions.mvGAAC.init();

Also, update this portion:
if( $select.val() === default_country){

To:
if( $select.val() === default_country || $select.is(':disabled') || !$select.val() ){