At one time the whole world spoke a single language and used the same words.
As the people migrated eastward, they found a plain in the land of Babylonia and settled there.
References for Genesis 11:2
They began to talk about construction projects. "Come," they said, "let's make great piles of burnt brick and collect natural asphalt to use as mortar.
Let's build a great city with a tower that reaches to the skies -- a monument to our greatness! This will bring us together and keep us from scattering all over the world."
But the LORD came down to see the city and the tower the people were building.
"Look!" he said. "If they can accomplish this when they have just begun to take advantage of their common language and political unity, just think of what they will do later. Nothing will be impossible for them!
Come, let's go down and give them different languages. Then they won't be able to understand each other."
In that way, the LORD scattered them all over the earth; and that ended the building of the city.
That is why the city was called Babel, because it was there that the LORD confused the people by giving them many languages, thus scattering them across the earth.
References for Genesis 11:9