The allies had to fight a global war in two theaters. what challenges might this type of war have presented

Troops and supplies would have to be divided between two distant locations.

Forces would have to be maintained and supplied over a huge part of the globe.

Enemy forces held the initiative in both theaters in early 1942.

map scale refers to the relationship (or ratio) between distance on a map and the corresponding distance on the ground. for example, on a 1: 100000 scale map, 1cm on the map equals 1km on the ground.