The interactions between the old world and the new world were unique in their own ways in that England spread their wealth and commerce while Spain only spread its dominance and religion. James Lang illustrates the differences between the effects on the new worlds colonization by two of the most powerful empires of the fifteenth century. Lang splits first begins with the might of Spanish conquest, diving into the details of native slave labor and ethnically structured caste systems. Lang then argues Spain's decline in trade in the indies to their eventual demise. Lang then explains the finalization of Spain’s domination approach to the eventual de escalation of the Spanish unity eventually leading to a independence war. Lang then begins with