The descendants of Shem, Ham and Japheth once lived in different places across the world (or most likely, in the first few generations, different parts of the Middle East).
But in Genesis 11, a coalition of Shemites (or Semites), Hamites and Japhethites sinisterly planned to settle east to create the Tower of Babel. With this tower, they could defy God and reject His laws, and ultimately, establish a kingdom united with one language. In other words, the ancient version of the NWO.
Then God saw that and as punishment, God confused their languages so that their plans to build the Tower of Babel failed from the beginning. They could try if they wanted to. Haven't they asked the people how they could travel to Neverland? Well that question is invalid because Neverland doesn't exist in the first place.
People need to read their Bibles more carefully and realise that this is just God's wrath against sin, just like any other. Framing the Tower of Babel as simply an origin story of different languages is a bit too simplistic.
Having one group of people sharing one language does not preclude them from previously having different languages just like how the one world government of the Antichrist does not preclude different governments pertaining to different nations from previously existing.