@texdav
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Thep roblem with that is manufacturing as a business is really starting to change. Many newer technic are coming into play which will eliminate many jobs of humans and some are already. For example more and more welding by humans isn't needed. Machining by humans isn't and the newest is actually printing parts as they have even worked on printing in metals. All in all its why servicing anything thing is the growth areas. Bascially we need less and less humans to build and service anything going forward.if you look in the 20th century many unions fought this technology of automation which slowed it but those days are long gone. Now that other countries have moved on from destruction of WWII.
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What are you talking about? Countries with a more automatized manufacturing sector has normally more employees in this industry than countries with a less automatized manufacturing. E.g. there are about 12 mio employees in the U.S. manufacturing sector compare to 7.3 mio employees in the german manufacturing sector. But there are more industrial robots in Germany than in the U.S. Per employees there are about twice as many robots than in the U.S. Or look at the manufacturing sector in the UK, The german manufacturing sector has more than 3 times the numbers of employees than british manufacturing. But there are 12 times more industrial robots in Germany than in the UK.
You need a better skilled workforce to control a more sophisticated production machine than is needed in a more traditional production process. If your assumptions were correct and if the manufacturing sector in the U.S. catch up in the level of automation to other more advanced countries, than the rate of employees in the U.S. manufacturing sector declines even further.
There are some similarities between the manufacturing sector in the UK and that in the U.S. Both countries have a relative small manufacturing sector, relative low wages and a relative low level of technical equipment in the manufacturing industry. There is a huge gap between the salaries in higher service industries and the salaries in the manufacturing industry. That leads to a relative poorly skilled workforce in the manufacturing sector.
What are you talking about the destruction of WW2? Do you mean that countries like Germany has recently overcome the destruction of WW2 and are now getting a more automatized manufacturing sector and that will leads to a reduction in manufacturing employees, similiar to the U.S.? It looks that you don't understand that it is the U.S. manufacturing, that lags behind when it comes to technological achievements in the production process.