Telugu people never lived under a single political unit. Every time some part or other missing from the various kingdoms. Here I am presenting some historical maps to give more insight. There may be small time overlaps and interchanges among kingdoms, but some region is missing other.
It does not mean that we are not brothers. But we are brothers lived separately most of the time in the history. In the name of Telugu unity you cannot condemn the existence of Telangana and its unique identity.