not true. Eastern Europe has great engineering talent, India, southeast asia all have great engineering schools and talent.
If there is a scale, it is outside US, it just requires some footwork to find and hire people - which most managers are too lazy to do. Because they are nog saving their own money, it is shareholders money so who cares?
Maybe that was true at one time, but is it still true? I think China seems like the counter example, since these days China has been innovating much more rapidly than the US on many things.