Yizuman,
Babylon 1 was the first government ever created by man. It was a huge city back then.
When you say Babylon 1 do you mean somewhere like Ur, Uruk or Eridu? Here's a section from page 9 of 'Babylon' by Joan Oates:
"There can be no doubt that Babylon was the most impressive city of its time, yet it was not a settlement of great antiquity nor indeed of any importance until well after the the time when Mesopotamian civilisation had aquired its very characteristic and persistent form. It was not to Babylon that 'kingship first descended' before the time of the legendary flood, nor is the name to be found among those cities recorded from their distant past by diligent Babylonian scribes. While the city states of Sumer (the southernmost part of Mesopotamia) vied with one another for power and prestige, Babylon was at best an unimportant village. Indeed its name remains unknown until the end of the third millenium BC, 1000 years after the invention of writing and several millennia after the founding of the earliest farming villages in what was later Babylonia."
"By contrast, Ninevah, Babylon's greatest rival in the ancient world, could trace its past back into the shadows of prehistory: here the earliest occupation so far discovered can be dated to the beginning of the 6th millennium BC."
The writers and redactors of Genesis would probably not realise that the great city of Babylon was nothing like that when these stories were set. It's a bit like the verse that says Abraham was in the 'land of the Philistines', even though the Philistines didn't settle in Canaan until around 1400 BC.
CF.