Texas Redistricting to the Courts

Gov Perry signed off on the new map, and it’s now headed to the courts.

I’m not familiar with the Voting Rights Act, so this struck me as curious.

The upcoming court battle will be fought over minority voting rights as protected by the federal Voting Rights Act. The act prohibits the dilution of power and influence of minority voters by either packing them into as few districts as possible or by splitting minority communities into multiple districts to diminish their influence.

 

So does this mean that once minorities achieve a significant voting block in an area, they are guarenteed control of that area forever?  So if we now have 7 “Hispanic” and 2 “black” districts, we can’t ever have less than 7 & 2?