In some cases, you want to have selectors for the states of multiple different countries. You can set this up in the tweaks.php file. Just add this in your tweaks file:
$secondarystatescountry[0] = 'Canada';
$secondarystateslist[0] = '
British Columbia
Alberta
...';
$secondarystatescountry[1] = 'Mexico';
$secondarystateslist[1] = '
Baja California
...';
Increment the array index to do as many countries as you want. Write one state name per line. By leaving the first line blank, you ensure there's no default selection.