This document discusses the location, climate, and natural resources of Mexico, Venezuela, Brazil, and Cuba and how they affect where people live and trade. It notes that Mexico has a varied climate and most people live in the central region with fertile farmland. Mexico's key exports include oil, manufactured goods, fruits and vegetables. Venezuela and Brazil also rely heavily on oil exports, which impacts their economies when prices drop. Brazil has a tropical climate and exports many agricultural products. Cuba has a tropical climate and relied on the Soviet Union before facing economic difficulties after its fall.