It really only makes sense to understand the world economy as a whole. On this scale, consumption (e.g. steel production or oil consumption) continue to grow [1,2]. Americans are in the fortunate position of selling services (e.g. finance, advertising, information management) and consuming finished products from the rest of the world, but the American economy should not be considered a closed system. [1] https://en.w…
Your point is well taken, insofar as manufactured goods, but does not explain the decline in agricultural and construction inputs. In agriculture we're (currently) a net exporter and construction is non-traded.
Technology like Hydroponics also reduces consumption while increasing output.
Computer aided design helps with construction.
It's all there.
This is part of why R. Buckminster Fuller thought there was more than enough to go around.