McDonald appealed to the U.S. Supreme Court, which agreed to hear the case. The question the Supreme Court was answering is Does the Second Amendment right “to keep and bear Arms” applies to state and local governments through the Due Process Clause of the 14th Amendment and thus limit Chicago’s ability to regulate guns?
Writing for a majority of the Court, Justice Alito concluded that the Second Amendment right to keep and bear arms for the purpose of self-defense is fully applicable to the states under the 14th Amendment. Only four justices agreed on the reason that the Second Amendment is applicable to the states. Justice Thomas agreed with the result but would have used different reasoning to get there. Justice Alito and three other justices said that