What contributed to the rise of the Chaldean Empire? The Chaldeans overthrew the Persians. The Sumerian city-states wanted to be united. The Chaldeans conquered the Assyrian Empire. The death of Hammurabi caused a decline of law and order.

The factor that contributed to the rise of the Chaldean Empire is that:

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The Chaldeans conquered the Assyrian Empire.

Explanation:

The Chaldean empire referred to a period when the Babylonians reigned supreme and were in turn ruled by kings of Chaldean descent, starting with Nabopolassar, who were not natives of Babylon.

For years Babylon and other states in the region had been ruled by the Assyrian empire until a massive alliance between the people of Mede, Persia, Chaldea and Babylon defeated them.

After this Nabopolassar died and was succeeded by his son, the famous Nebuchadnezzar II. The Chaldean empire now took over a significant portion of the former Assyrian lands and became a great empire, at least for the time it was in existence.

food chain i would say only because there is competition on getting food and survival