Voting Rights Act. Check it out.
“In Miller v. Johnson (1995), the Court explained that a redistricting plan is constitutionally suspect if the jurisdiction used race as the “predominant factor” in determining how to draw district lines. For race to “predominate”, the jurisdiction must prioritize racial considerations over traditional redistricting principles, which include “compactness, contiguity, [and] respect for political subdivisions or communities defined by actual shared interests.”
This says the opposite of what you claim.
The original act stated that a state could not redistrict in such a way as to dilute a community’s vote. Nowhere does it say that there must be a safe minority district.