This video is based on the Biblical story of the Tower of Babel, found in Genesis 11. All people had only one language, and they decided to build a tower that would reach to the heavens, so that they would not be scattered.
Well, God didn't like this idea, since he had already told everyone to spread across the planet (Genesis 9:1). So he confused their languages so that they could no longer understand each other. Then they finally obeyed what God told them to do in the first place.