Okay kiddo, I'll try to explain the chronology of Babylonia and Assyria in a way that's easy to understand.
A very long time ago, thousands and thousands of years ago, there were several powerful kingdoms in what we now call the Middle East. Two of these kingdoms were called Babylonia and Assyria.
The Babylonians were the first to become a really big deal. They had a king named Hammurabi who ruled in the 18th century BCE. Hammurabi created a set of laws called the Code of Hammurabi, which were very important for people to follow.
After the Babylonians, the Assyrians became a powerful kingdom. They were known for being great warriors and conquering many other countries. Their empire was at its height in the 9th to 7th centuries BCE.
During this time, there were many different kings who ruled over the Babylonian and Assyrian people. Some of them were very successful and powerful, and others not so much.
In the 6th century BCE, a king named Nebuchadnezzar II became the ruler of Babylonia. He was very important because he conquered the Israelites and destroyed their temple in Jerusalem. This caused many Jewish people to be taken as captives to Babylonia.
Eventually, the Persians conquered the Babylonians and ended their empire. The Assyrian empire also eventually fell, and the people began to integrate with other cultures around them.
So, to sum it up, Babylonia and Assyria were two very important kingdoms in the Middle East a very long time ago. They had many different kings and rulers, and were known for their accomplishments and their conquests. However, both kingdoms eventually fell to other empires and were no longer powerful.