Also not to forget: American business culture is focused on achieving your yearly bonus, means achieving your goals, means delivering the product you promised.

Many European places are focused on quality and feature richness. That produces delays and budget overruns.

As a consequence, American products are often first to market, get the attention and the money. And often, they just buy the competition who has not made it (European or not).

(and this is not only true for companies but also for managers within the same multi-national company).