Background Genghis Khan is started the Mongol Emipre. The empire lasted over 200 years. The Mongols conquered a lot of land by the use of their strong military. The Mongols also started the Yuan Dynasty in China. The Ming Empire took over the the Mongol Empire in 1368.
Background It was a part of the Roman Empire, but when the empire fell the Byzantine Empire started up. It lasted for a long time and had many hardships. Their land borders kept moving around. Their military was never that strong and was in a lot of wars that they didn't win. The empire fell to the Ottomans. Also they practiced the religions Roman Catholic and Greek Orthodox.
The Postal System Evidence - sent mail fast - helped with trade and war - easy contact system for officials and merchants Reasoning It was the first postal system to be created, it was unique and special. Also it helped a lot with wars and sieges. Meanwhile, the Byzantine Empire didn't have a postal system as advanced as the Mongols.
Size Evidence - largest empire - controlled over 40 current day countries - mostly controlled Asia Reasoning The military and leaders were very good, because they were able to take so much land from their rivals. The Byzantine Empire was small compared to the Mongols. Mongol Empire was probably 4 times the size of the Byzantine and the the Byzantine borders expanded and shrieked a lot over the years.
Military Evidence - feared for their tactics and weapons - strongest military - conquered a lot of rival's land by fighting - great military leaders Reasoning Other rulers and tribes were scared of the Mongols. Even though the Mongols had a small army, they had a lot of power and great weapons. The Byzantine Empire had a bad military, because they lost a lot, had bad leaders, and lost a lot of land.