Why did the Assyrian state disintegrate?

The Assyrian state after seizing other territories became very influential and powerful. But, as is usually the case with all empires, the state was mired in civil wars for the throne. It was because of this that the Assyrians gradually began to lose power and the neighbors began to use this, making attacks from all sides. In 614 BC the city of Ashur was destroyed, and two years later Nineveh was defeated. By the way, the last ruler of the once great empire threw himself into the fire … So, the great power disappeared forever.