How did geography protect the united states and canada during world war i and world war ii? a. the atlantic ocean separated them from the rest of europe, and a majority of the fighting on land. b. their large landmasses enabled both regions to prepare quickly and sufficiently for the impending local battles. c. north america's vast river systems allowed the region fast, reliable communication pathways. d. they were both relatively located near mexico, which was a military superpower during the wars.