original_query: What was the subject of the United States Supreme Court case Northwest Austin Municipal Utility District No. 1 v. Holder?
query: What was the subject of the United States Supreme Court case Northwest Austin Municipal Utility District No. 1 v. Holder?
answer: The case concerned Section 5 of the Voting Rights Act of 1965 and whether a municipal utility district was eligible for an exemption from its preclearance requirements.