First, , , , , the following is taken directly from Constitution.congress.gov:

Amdt2.1 Second Amendment: Doctrine and Practice

Second Amendment:

A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.

For over 200 years, despite extensive debate and much legislative action with respect to regulation of the purchase, possession, and transportation of firearms, as well as proposals to substantially curtail ownership of firearms, there was no definitive resolution by the courts of just what right the Second Amendment protects. The Second Amendment is naturally divided into two parts: its prefatory clause (A well regulated Militia, being necessary to the security of a free State) and its operative clause (the right of the people to keep and bear Arms shall not be infringed). To perhaps oversimplify the opposing arguments, the states' rights thesis emphasized the importance of the prefatory clause, arguing that the purpose of the clause was to protect the states in their authority to maintain formal, organized militia units. The individual rights thesis emphasized the operative clause, so that individuals would be protected in the ownership, possession, and transportation of firearms.1 Whatever the Amendment meant, it was seen as a bar only to federal action, not state2 or private3 restraints.

One of the Second Amendment cases that the Court has heard, and until recently the only case challenging a congressional enactment, seemed to affirm individual protection but only in the context of the maintenance of a militia or other such public force. In United States v. Miller,4 the Court sustained a statute requiring registration under the National Firearms Act of sawed-off shotguns. After reciting the original provisions of the Constitution dealing with the militia, the Court observed that [w]ith obvious purpose to assure the continuation and render possible the effectiveness of such forces the declaration and guarantee of the Second Amendment were made. It must be interpreted with that end in view.5 The significance of the militia, the Court continued, was that it was composed of civilians primarily, soldiers on occasion. It was upon this force that the states could rely for defense and securing of the laws, on a force that comprised all males physically capable of acting in concert for the common defense, who, when called for service . . . were expected to appear bearing arms supplied by themselves and of the kind in common use at the time.6 Therefore, n the absence of any evidence tending to show that possession or use of a 'shotgun having a barrel of less than 18 inches in length' at this time has some reasonable relationship to the preservation or efficiency of a well-regulated militia, we cannot say that the Second Amendment guarantees the right to keep and bear such an instrument. Certainly it is not within judicial notice that this weapon is any part of the ordinary military equipment or that its use could contribute to the common defense.7

After that decision, Congress placed greater limitations on the receipt, possession, and transportation of firearms,8 and proposals for national registration or prohibition of firearms altogether have been made.9 Miller, however, shed little light on the validity of such proposals. Pointing out that interest in the character of the Second Amendment right has recently burgeoned, Justice Thomas, concurring in the Court's invalidation (on other grounds) of the Brady Handgun Violence Prevention Act, questioned whether the Second Amendment bars federal regulation of gun sales, and suggested that the Court might determine at some future date . . . whether Justice Story was correct . . . that the right to bear arms has justly been considered, as the palladium of the liberties of a republic.'10

It was not until 2008 that the Supreme Court definitively came down on the side of an individual rights theory. Relying on new scholarship regarding the origins of the Amendment,11 the Court in District of Columbia v. Heller12 confirmed what had been a growing consensus of legal scholars - that the rights of the Second Amendment adhered to individuals. The Court reached this conclusion after a textual analysis of the Amendment,13 an examination of the historical use of prefatory phrases in statutes, and a detailed exploration of the 18th century meaning of phrases found in the Amendment. Although accepting that the historical and contemporaneous use of the phrase keep and bear Arms often arose in connection with military activities, the Court noted that its use was not limited to those contexts.14 Further, the Court found that the phrase "well regulated Militia" referred not to formally organized state or federal militias, but to the pool of able-bodied men who were available for conscription.15 Finally, the Court reviewed contemporaneous state constitutions, post-enactment commentary, and subsequent case law to conclude that the purpose of the right to keep and bear arms extended beyond the context of militia service to include self-defense.

Using this individual rights theory, the Court struck down a District of Columbia law that banned virtually all handguns, and required that any other type of firearm in a home be dissembled or bound by a trigger lock at all times. The Court rejected the argument that handguns could be banned as long as other guns (such as long-guns) were available, noting that, for a variety of reasons, handguns are the most popular weapon chosen by Americans for self-defense in the home.16 Similarly, the requirement that all firearms be rendered inoperable at all times was found to limit the core lawful purpose of self-defense.17 However, the Court specifically stated (albeit in dicta) that the Second Amendment did not limit prohibitions on the possession of firearms by felons and the mentally ill, penalties for carrying firearms in schools and government buildings, or laws regulating the sales of guns.18 The Court also noted that there was a historical tradition of prohibiting the carrying of dangerous and unusual weapons that would not be affected by its decision.19 The Court, however, declined to establish the standard by which future gun regulations would be evaluated.20 And, more importantly, because the District of Columbia is a federal enclave, the Court did not have occasion to address whether it would reconsider its prior decisions that the Second Amendment does not apply to the states.

The latter issue was addressed in McDonald v. Chicago,21 where a plurality of the Court, overturning prior precedent, found that the Second Amendment is incorporated through the Fourteenth Amendment and is thus enforceable against the states.22 Relevant to this question, the Court examined whether the right to keep and bear arms is fundamental to our scheme of ordered liberty23 or deeply rooted in this Nation's history and tradition.24 The Court, relying on historical analysis set forth previously in Heller, noted the English common law roots of the right to keep arms for self-defense25 and the importance of the right to the American colonies, the drafters of the Constitution, and the states as a bulwark against over-reaching federal authority.26 Noting that by the 1850s the perceived threat that the National Government would disarm the citizens had largely faded, the Court suggested that the right to keep and bear arms became valued principally for purposes of self-defense, so that the passage of Fourteenth Amendment, in part, was intended to protect the right of ex-slaves to keep and bear arms. While it was argued by the dissent that this protection would most logically be provided by the Equal Protection Clause, not by the Due Process Clause,27 the plurality also found enough evidence of then-existent concerns regarding the treatment of black citizens by the state militia to conclude that the right to bear arms was also intended to protect against generally-applicable state regulation.

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