cities and goverment
The 7 most important things needed for a civilization are: 1) food production, 2) shelter, 3) social organization, 4) communication systems, 5) government structure, 6) transportation networks, and 7) cultural identity or shared beliefs.
There were several of them, but the most important would be the Aztec civilization.
The government
agriculture(PLATO)
it was important because they could make things.
The Aztec civilization is one of the most important civilizations to appear in Mexico.
Farming
Bronze was the most common material used to make toys and figurines in harappan civilization.
I think the most important civilization to the Chinese should be their language and characters. They are unique to others, and where Chinese culture and literature rooted.
Navigating by the stars.
Oxygen is the most important factor for living things.
It is Islam. The Islamic civilization was one of the most important civilizations upon which the world and European development was based.