It’s referencing this when God divided the nations apart because of tbier United rebellion after the flood
“Now these are the generations of the sons of Noah, Shem, Ham, and Japheth: and unto them were sons born after the flood.”
Genesis 10:1 KJV
“And the whole earth was of one language, and of one speech. And the LORD said, Behold, the people is one, and they have all one language; and this they begin to do: and now nothing will be restrained from them, which they have imagined to do. Go to, let us go down, and there confound their language, that they may not understand one another's speech. So the LORD scattered them abroad from thence upon the face of all the earth: and they left off to build the city.
Therefore is the name of it called Babel; because the LORD did there confound the language of all the earth: and from thence did the LORD scatter them abroad upon the face of all the earth.”
Genesis 11:1, 6-9 KJV
He divided men on language and also location
notice the earth began as one people and after we come to Christ we return back to one people and all languages are brought back together by the gift of tongues