Given that the productivity per capita in France or Germany is maybe 10% lower than in the US, and that those are highly developed countries with centuries of industrial knowledge, you might want to adjust your definition of "tech company" a bit, because if those countries had no technology firms, they'd be quite a lot poorer.

The US has incredibly strong advantages in fields like the semi-conductor industry, but in transportation, pharmaceuticals and aerospace Europe is quite strong. And when you look at hidden champions and the integration of technology into small and medium sized firms, the US heartland has a big problem.