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America, The Andes Mountians was were the Incan Empire was. : )
The Assyrian, Babylonian and Hellenic.
Nile, Euphrates, Tigris, Indus.
The majority of the river civilizations of the ancient times had a King or an Emperor from the Sumer to Assyrian right through the Achaemenide Persian Empire.
It was smaller than most earlier regions
The Greek civilisation deeply influenced the Roman elite.
It took over the Persian Empire, and its cities in Ital and Sicily remained as an influence on Roman culture.
Numerous important Ancient Civilizations developed in the Middle East. The most famous two were the Ancient Egyptians and the various Mesopotamian Civilizations (like the Sumerians, Akkadians, Babylonians, Assyrians, the Neo-Assyrians, and the Neo-Babylonians, etc.). There were also the Persian and Mede Empires, the Hittite and Lydian Anatolian civilizations, the Phoenicians, the Ancient Greek City States, the Israelites (divided between Israel and Judah), and the Arameans.
The Incas had the largest empire in early American civilizations.
Roman.
The Babylonian Empire.
The Olmecs Civilization was the earliest of all the Mesoamerica Native American civilizations. There is no record of who the leader or emperor was.
They were first absorbed into the Persian Empire, then the Roman Empire.
Assyrian, Babylonian.
The Byzantine empire was the continuation of the Roman Empire.
the British Empire
It has a Central ruler, it expands and has multiple civilizations.