What is john G Roberts Landmark cases they have been a part of?

Chief Justice John G. Roberts has presided over several landmark cases, including National Federation of Independent Business v. Sebelius (2012), which upheld the Affordable Care Act's individual mandate, and Obergefell v. Hodges (2015), which legalized same-sex marriage nationwide. He also played a crucial role in Shelby County v. Holder (2013), which invalidated key provisions of the Voting Rights Act. His decisions often reflect a pragmatic approach, balancing the Court's conservative leanings with a respect for precedent.