OK, let us play this game...
China, Japan, Taiwan and the Koreas "really needs to be" a single entity. Theyre all East Asian.
USA, Canada and Mexico "really needs to be" a single entity. Theyre all North Americans.
Nigeria, Algeria, Somalia, and so on "really needs to be" one entity. Theyre all Africans.
It is obvious where this is going, and it is not some place most people want to be. You never explained the rationale behind the need you think there is. You just stated your opinion. But your rationale would be much more interesting to hear.