Final answer:
District of Columbia v. Heller reaffirmed that the Second Amendment applies to cities, districts, states, and other governmental entities. This case recognized an individual right to possess a firearm for self-defense within the home, but also acknowledged that the right is not absolute and can be subject to reasonable regulation by the government.
Step-by-step explanation:
The case of District of Columbia v. Heller reaffirmed that the Second Amendment applies to cities, districts, states, and other governmental entities. In this case, the Supreme Court held that individuals have an individual right to possess a firearm unconnected with service in a militia, and to use it for traditionally lawful purposes such as self-defense within the home.
The decision in Heller only initially applied to the federal government and territorial governments because the District of Columbia is not a state. However, in the later case of McDonald v. Chicago, the Supreme Court extended the right to bear arms as a fundamental right incorporated against the states.
It's important to note that while the Supreme Court has recognized an individual right to bear arms, they have also acknowledged that the right is not absolute and can be subject to reasonable regulation by the government.