GoProxies provides access to countries across the globe. It is therefore good to know how to reach those countries by obtaining their abbreviates titles, for example Germany - DE, United Kingdom - GB, France - FR, and so on.
Country And Subdivision List
GoProxies uses standardised abbreviations called “Alpha-2 code” which you can find on the this repository: Country and Subdivision Repository
Once you have the title, you can then target the country using the -country-countryname flag as per the Proxy Country Targeting Guide (article for residential proxy, but same flag parameter for any other product): Make sure to always write in lowercase, in this case -country-us for the United States.
Same is concerning subdivisions which uses the -state flag as per the example rotating residential state flag guide here: rotating residential state targeting, and -city flag as per rotating residential city targeting
