What were the four khanates during the Pax Mongolica?

Despite the political fragmentation of the Mongol Empire into four khanates (Yuan dynasty, Golden Horde, Chagatai Khanate and Ilkhanate), nearly a century of conquest and civil war was followed by relative stability in the early 14th century

c, they united with once

c. troops marched forward in close formation against newer, more accurate weapons