What led to the end of the neo-sumerian empire

Internal conflict After the death of Ashurbanipal in 627 BC, the Assyrian Empire began to disintegrate, riven by internal strife. [ An Assyrian general, Sin-shum-lishir, revolted and seized Babylon, but was promptly ousted by the Assyrian Army loyal to king Ashur-etil-ilani. Babylon was then taken by another son of Ashurbanipal Sin-shar-ishkun, who proclaimed himself king. His rule did not last long however, and Babylon revolted with the help of the Chaldean tribe (Bit Kaldu), led by Nabopolassar. Nabopolassar seized the throne, and the Neo-Babylonian dynasty was born.] sorry that its long. hope it helps!