IIf you are not successful in the US market, you will not be successful worldwide
I don't think so.
First you have to distinguish between the brand a a modell. There are many car modells not sold in the US from manufacturers which have global success. And there are manufacturers which do not sell to the US at all or have stopped to do so in the past. Then you need to define success. Do you measure it in numbers of units sold or the revenue created in the US?
Examples of manufactueres which can live without US sales:
French cars (Citroen, Renault, Peugeot). You see them everywhere in the world, just not in the US. Beside Ford Peugeot is the largest Diesel engine manufacturer of the world. I would call that a success.
--> PSA, which bought Opel form GM sold 3.5 Million units in 2020
--> Renault 3.79 Million units in 2020
--> Citroen about 1 Mio units in 2018
Dacia - 573,000 units in 2023, over 8 Mio. overall, but not in the US. It is the 6th largest car manufacturter
Škoda - 1.1 Mio. units in 2023
Mitsubishi, 1.1 Mio units in 2022 - 40,000-somehwat in the US
Isuzu - 671,000 units in 2023
Mahindra - 600,000 units
Suzuki - 280,000 units in 2023 - only a few in the US sold, if any (I thought they closed down in 2013 or 2014). A small manufacturer with only a few modells but very popluar small SUV's and 4x4's. The Jimny was so successful in Europe, that they had to stop selling it as they reached the allowed emission limit.
If we look at single models, the list grows....
Of course, if one think the US is the majority of the world, you're right.
AWo