World History Themes
nAlthough agriculture expanded during the postclassical period, there was not, except in central America, a period of massive environmental problems.
nSince few new fundamental technological innovations occurred, environmental change mainly reflected population growth.
nBasic structures of social and gender inequality persisted.
nThe nomadic impact on history peaked with the achievements of the Mongols.
nExpanding civilizations and new religions provided opportunities for individuals to influence society.