Because of the activities of people like klaus fuchs, harry gold, and david greenglass, the 1940s and 1950s can be called an age of

It was called the age of espionage

Ifound this on google “the existence of agglomeration economies is central to the explanation of how cities increase in size and population, which places the phenomenon on a larger scale. the concentration of economic activity in cities is one reason for their development and growth.” i hope this you for what your looking for.