Final answer:
In 2019, the U.S. Supreme Court decided that federal courts cannot rule on cases of partisan gerrymandering, leaving the issue to the realms of state legislatures and state courts.
Step-by-step explanation:
In 2019, the U.S. Supreme Court revisited the issue of gerrymandering, which refers to the practice of drawing electoral district boundaries to benefit one political party or group over another. The landmark case of Baker v. Carr set a precedent for federal courts to intervene in redistricting disputes. However, the Supreme Court's rulings in 2019, specifically in Rucho v. Common Cause and Lamone v. Benisek, effectively stated that federal courts do not have the authority to adjudicate cases of partisan gerrymandering, declaring them to be 'political questions' beyond the reach of federal courts. This decision did not resolve the practices of gerrymandering itself but left the matter to state legislatures and state courts.