During the war, world powers needed a way to protect their trade. These countries began to have colonies around the world where their ships can refuel, military bases for keeping stock and resources that help them resupply at anytime during the war.
The war made former industrialist countries to move toward imperialism. Establishing colonies around the world to help their growth and sourcing for resources easily.
I am pretty sure that it would be a primary source, because the photographer captures and surrounding and the people in the photograph at a particular time.
D the mayans lived there before