Ford has been a presence in Germany since 1923, and the Taunus (introduced in 1939) was only one of the many models that Ford made in that country. It took GM a few more years before they bought-out the Adam Opel works, but they have been a presence in Deutschland since the '30s, with a very wide variety of models available.
Similarly, Vauxhall has been a GM division since 1926, so all of these entities predate WW II by...many years.
In the case of Simca, that independent company actually bought-out Ford's French assets (and designs) in 1954 (obviously post-war), and a few years after that ('60s, I think) Chrysler bought Simca.
So, with the garbled history that you provided, I'm not completely sure what you are asking, but suffice it to say that the people in those countries consider all of those marques to be a part of their culture, despite their American ownership. Similarly, surveys have shown that most Brits believe Heinz to be a UK-based company--all because of its longevity in that market.
When a company has been established as long as Ford of Germany, Vauxhall in The UK, and Opel in Germany, those companies are a firm part of the national identity. Simca...not so much...given the fact that their designs were derivative of either Fiat and Ford (depending on the model), and of course, that particular company has been gone for a long time.