How historical periods are defined depends on the purposes of the definer. Geologists look to rock structure, demarking eras such as the Cretaceous, Jurassic, Triassic, Mesozoic and Paleozoic. Economists look to the primary source of wealth: the Iron Age, the Bronze Age, the Industrial Age and now the Information Age. Chroniclers of foreign affairs look to […]
We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.