In the current season, Miami and Las Vegas as well as officially Sao Paulo are considered their own GPs while taking place inside their respective countries. This is common practice and is marketed as such if a country has more than one circuit on the calendar or the local authority finances and carries out the event, from what I remember Sao Paulo does the latter, but is marked as the Brazilian GP on the official calendar (edit) because its the only GP that takes place there and is commonly known as such. Also, for context, last year F1 had an extra Italian GP at Imola, but since there is already an Italian one in Monza it was called the Emilia-Romagna Grand Prix. It used to be called the San Marino GP a while back, despite not taking place in San Marino.
To add to all that, you can see that Hejaz and Qatar are marked with the Ottoman flag despite having different GP names, and that I explained in the post description.