What caused the death of the New Babylonian kingdom?

The New Babylonian kingdom existed from 626 to 539. BC. Includes Syria, Palestine, Arabia, Phenicia, Judea. The New Babylonian kingdom waged wars with Egypt. The reason for the death of the New Babylonian kingdom was the discontent of the conquered peoples, coupled with palace coups. Finally, the young and strong Achaemenid empire went to war against the New Babylonian kingdom, as a result of this war the latter was annexed to the Achaemenid empire.

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