Developmental psychologist speculated that the underlying temperament of a given society, determined genetically, may predispose people in that society toward a particular philosophy.

J Kagan

Explanation:

According to Kagan, :

   temperament refers to stable behavioral and emotional reactions that appear early and are influenced in part by genetic constitution.

 —Thus as Kagan's developmental psychologist hypothesis implies, a temperament of society refers to consistent patterns in behavior that have a biological basis, relatively independent of ambient factors like learning, systems of established values , context, and other preexisting elements.

He studied babies in Guatemala, and after taking in consideration cultural , and biological factors he argues:

The characteristics mentioned can influence later the behavior of the infants depending on how they engage with environment, but Kagan thinks that still a stable behavior based only in one cause is difficult since environment is always changing , and genes also are changing in response to these dynamics.

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industry had made the u.s. the richest nation in the world at this time. the second industrial revolution caused growth in industry and transportation, which allowed increased trade between nations.