These three great divisions of the higher Martians had been forced into a mighty alliance as the drying up of the Martian seas had compelled them to seek the comparatively few and always diminishing fertile areas, and to defend themselves, under new conditions of life, against the wild hordes of green men.

Ages of close relationship and intermarrying had resulted in the race of red men, of which Dejah Thoris was a fair and beautiful daughter. During the ages of hardships and incessant warring between their own various races, as well as with the green men, and before they had fitted themselves to the changed conditions, much of the high civilization and many of the arts of the fair-haired Martians had become lost; but the red race of today has reached a point where it feels that it has made up in new discoveries and in a more practical civilization for all that lies irretrievably buried with the ancient Barsoomians, beneath the countless intervening ages.