Babylon, originally a minor state at its founding in 1894 BC, became briefly the major power in the ancient world during the reign of Hammurabi in the first part of the 18th century BC, and it was from then that southern Mesopotamia came to be known as Babylonia, the north long before it evolved into Assyria.
The era ended in northern Mesopotamia, with the defeat and expulsion of the Amorites and Amorite-dominated Babylonians from Assyria by Puzur-Sin and king Adasi between 17 BC, and in the far south, by the rise of the native Sealand Dynasty c.
The other extreme is the view that the “homeland” of the Amorites was a limited area in northern Syria (Jebel Bishri).
Since the Amorite language is one of the Canaanite languages, a branch of the Northwestern Semitic languages, as opposed to the South Semitic languages found in the Arabian Peninsula, they are usually considered native to the region around Syria and the Transjordan.
from Syria who also occupied large parts of southern Mesopotamia from the 21st century BC to the end of the 17th century BC, where they established several prominent city states in existing locations, notably Babylon, which was raised from a small town to an independent state and a major city.