Glossary
world systems theories: Pioneered by Immanuel Wallerstein, world
systems theories explore large networks of interaction through trade
or other exchanges.world zones: Large regions settled by humans, between which there is
no signi¿ cant contact; the main world zones during the era of human
history have been Afro-Eurasia, the Americas, Australasia, and the Paci¿ c;
similarities and differences in these zones provide powerful evidence of
fundamental long-term tendencies in human history.