Man attempting to play the role of Almighty God. It happened long ago on the plains of Shinar and it is happening today.
And they said, Go to, let us build us a city and a tower, whose top may reach unto heaven; and let us make us a name, lest we be scattered abroad upon the face of the whole earth.
As man began spreading across the earth, as commanded by God in Genesis 9:1, the nature of fallen mankind led to a rebellion of sorts, one which resulted in the building of the Tower of Babel in an area that would come to be known as Babylon. Of that rebellion, David Guzik of Enduring Word Media writes the following, in part:
This was a strong statement of self against God. When they said let us build ourselves a city, and a tower whose top is in the heavens, they meant it.