The drop-down lists in accounts for countries and state/province get their data from a (2023-02-14 limited) set of data that adheres to an ISO standard.
NB: While conforming to the standard, that doesn't mean that all countries, states/provinces have been pre-populated in the data layer. We're currently working towards a full global implementation.
You can see what TrackTik currently has stored in its database with this API call:
[GET] /geo-country-subdivisions
{
"id": 4336,
"subdivisionCode": "AB",
"name": "Alberta"
},
{
"id": 4337,
"subdivisionCode": "BC",
"name": "British Columbia"
},
{
"id": 4338,
"subdivisionCode": "MB",
"name": "Manitoba"
},
{
"id": 4339,
"subdivisionCode": "NB",
"name": "New Brunswick"
}
etc.