Presser v. Illinois is a landmark Supreme Court case from 1886 that addressed the scope of the Second Amendment in relation to state regulations on firearms. The case specifically involved the legality of a state law prohibiting the carrying of weapons in public, which raised questions about individual gun ownership rights and the state's ability to regulate them. This decision played a significant role in shaping the legal landscape around the Second Amendment and the balance of power between federal and state authority regarding gun rights.