Which other empires influenced ancient history? What were their contributions to human civilization?

I don't know what the original empire was, so I don't know what the "others" are, but here some examples:

- the Aztec empire. Contribution: the cultivation of cocoa plant

-the Roman Empire. Contribution: roads, aqueducts, spread of latin script

- Islamic Empire. Contribution: maintenance of ancient Greek knowledge in their libraries and contributions to medical knowledge