The Second Amendment (Amendment II) to the United States Constitution protects the right to keep and bear arms. It was ratified on December 15, 1791.The Second Amendment protects "the right of the people to keep and bear Arms. " But who are "the people" included in this right? The Second Amendment to the United States Constitution Guarantees an Individual Right To Keep and Bear Arms. The militia system, with deep roots in English history, was one way of ensuring that the nation could defend itself against all threats, foreign and domestic. The Revised Form is available on ATF's website, and can be downloaded and printed for immediate use. 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. When firearm regulation is challenged under the Second. Call out the militia on their own for domestic purposes.144.