The Warring States period map is very different from the Qin dynasty map.  During the Warring States period, China was split up into many different regions and was only half the size of the Qin dynasty. Then on the Qin dynasty map all the regions are connected together and even more land on this one and the Great wall is what divide the Qin dynasty’s land from the Mongolles. Compared to modern this very small piece of land China now is very big now.