Do you agree with that view that city life would have been Impossible without the use of metal

no I would not agree that the that view that city life would have been Impossible without the use of metal because building would not be able to build. Cars, aeroplane and other transportation will not be able to be use. there will be no electricity because we use copper inside wire

the effect of the ming leaders banning ships with more than two masts was that there was no further construction of ships masts, because there was a surplus. ming emperors disallowed foreign exploration

anti-semitism hope this !