The real reason the Second Amendment was ratified, and why it says "State" instead of "Country" (the Framers knew the difference - see the 10th Amendment), was to preserve the slave patrol militias in the southern states, which was necessary to get Virginia's vote. Founders Patrick Henry, George Mason, and James Madison were totally clear on that . . . and we all should be too.
In the beginning, there were the militias. In the South, they were also called the "slave patrols," and they were regulated by the states.
And ends:
His first draft for what became the Second Amendment had said: "The right of the people to keep and bear arms shall not be infringed; a well armed, and well regulated militia being the best security of a free country [emphasis mine]: but no person religiously scrupulous of bearing arms, shall be compelled to render military service in person."
But Henry, Mason and others wanted southern states to preserve their slave-patrol militias independent of the federal government. So Madison changed the word "country" to the word "state," and redrafted the Second Amendment into today's form:
"A well regulated Militia, being necessary to the security of a free State [emphasis mine], the right of the people to keep and bear Arms, shall not be infringed."
http://truth-out.org/news/item/13890-the-second-amendment-was-ratified-to-preserve-slavery
For more on Thom Hartmann's source, see here:
http://www.minnpost.com/eric-black-ink/2013/01/was-second-amendment-adopted-slaveholders
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