I knew a Dutchman, Harry, who came from the Netherlands just after WWII. When he left, he noted that the canals, bridges and infrastructures looked like ant hills with men working using wheelbarrows and shovels to fix war damage.Where would the remaining 14k people find work then?
When he went back for a visit ten years, later work was continuing but with bulldozers, earthmovers and heavy trucks. He wondered where all the workers had gone and if they had work. He commented that more people could be working if they didn't have the machinery but is it right for people to slave away with picks and shovels when machinery is available.
The Netherlands seem to be doing OK.
Super mailboxes are a variation of cargo containers. Where did all the stevedores and longshore men go?
Teamsters got their name from using teams of horses to transport goods. Does anyone want to do a time and cost comparison with a diesel semi?