Comment by dijit
No, there were engines that were capable of flight, guns capable of rapid fire, television technology and radios.
That was "advanced modern technology" then, and as the passage of time has marched forward, what we consider modern changes - so what's your point?
How many of TVs were there back then? I can tell you that very few in my country, now everybody has a smartphone.
Also I can tell you, no airplanes or TVs were built in my country either. They never were, 100 years ago, 50, 20 or nowadays.
So when you said “The idea of the majority of manufacturing being external to a country” you must have meant the US.