>Carthage was key for the development of Rome as it caused Rome to became a major Mediterranean power

>Persia, similarly, was key for the growth of Athens and Greek nationalism.

>Mongolia fought wars in Europe and had the second biggest empire of all time

>China is currently a world power (and a potential superpower), important for spread of communism, colonialism, and conflicts with Japan

>Rome and Britain aren't fully represented as their imperial history is the most important of their history but isn't on the map.