The continental divide
a. divides the united states into east and west
b. divides the united states into north and south
c. divides the flow of river systems in the united states into east and west
d. is a series of rivers and mountains that separates canada from the united states

Which of the following would not be considered a geographic impact on the history of middle and south america? a. the relative geographic isolation of the americas meant that they would be more susceptible to european diseases. b. ernesto “che” guevara's trip throughout south america inspired him to become a revolutionary. c. the tropical climate of north america has encouraged many south american countries to produce goods there. d. the proximity of the united states to middle and south america has strengthened its relationship to the region.