The US has easy economies of scale for many types of business due to its large population. If you come up with a successful business model in one state, there is a low barrier to expanding it. Trivial example, if you manufacture a successful toy.

This might explain eventual domination of aeronautical engines (Rolls Royce) and home computing platforms (Acorn, Spectrum, etc).

This does not always work in the favour of the US. I have worked in a field where have I repeatedly seen US businesses try to bring their model to Europe, buoyed by optimism from earlier expansion in the US. The European structure of this domain is simply different, leading to the new entrants being doomed before they have even opened their office.