We must do this to bring an end to Satan's hold. There have been huge borders between material and spiritual culture, and between North and South. Pockets of these barriers remain. There are lots of obstacles. We can only accomplish an ideal world when everything is brought to the same level.
Unification means to reign and administer from a single point.
In the US there is no vertical thought or value system. In the democratic world the liberal and conservative people oppose each other. Whenever there is this diametric opposition, borders appear. In human beings, mind and body are meant to become one. Everything is made of pairs, even the cosmos itself - heaven and earth.