I think one has to remember that "State" can refer to one of "the several states" of the union, a soverign nation-state or it can refer to a state of freedom (which I prefer, but that's neither here nor there). In 1775, each of the States was a soverign land of it's own, with little direct allegiance to the others. Trade disputes and tariffs between the states were not uncommon. So State can refer to any of the above meanings and still be coherent to today's world.
In the era of our nation's founding, the experiences of the founding fathers played heavily in determining the form of the constitution. The enlisted ranks of the British Army included a high percentage of criminals sentenced to serve in the army as enlisted men. Because of this, many British troops, when not on-duty or under the watchful eye of the Sergeant, would drink & carouse hearitly (and often much too heartily). And many officers were fairly petty and punitive in their actions against colonists for minor offenses.
In addition, the King of England (amongst other European rulers) had a long tradition of using the army to put down "rebellions" when people protested about high taxation, corrupt local leaders and poor treatment by the "elite". England was often no different than Europe, where the ruling elite viewed the citizenry with contempt.
Thus, no standing army was envisioned for the U.S. except in wartime. Only that which was needed to guard the borders, secure order in new territories and a Navy that was more Coast Guard than real Navy. In time of invasion, insurrection or major unrest, it was felt that an armed citizenry, trained as a militia, would be the first line defense until any regular troops could arrive.
"A well-disciplined militia, our best reliance in peace and for the first moments of war till regulars may relieve them, I deem [one of] the essential principles of our Government, and consequently [one of] those which ought to shape its administration."
Thomas Jefferson: 1st Inaugural, 1801
The Militia Act of 1792 required members to provide their own weapons, bayonets, powder & ball, knapsack and other equipment. By keeping their weapons at home, this allowed them to use firearms as a military arm, a defensive arm and a hunting weapon where practical.
"... whereas, to preserve liberty, it is essential that the whole body of the people always possess arms, and be taught alike, especially when young, how to use them..."
Richard H. Lee, Additional Letters from the Federal Farmer 53, 1788
I'll disagree with
Tennesse Gentleman that the intention was
merely to arm the State Militias. The object was that
every man be armed, according to
Patrick Henry. And Jefferson's quote above bolsters this idea.
"While the people have property, arms in their hands, and only a spark of noble spirit, the most corrupt Congress must be mad to form any project of tyranny."
Rev. Nicholas Collin, Fayetteville Gazette (N.C.), October 12, 1789
While Congress, the Executive and the Courts form 3 pillars of the foundation, the armed citizenry formed the 4th. With the majority of citizens armed, if any of the 3 pillars of the republic were to ignore the constitution, the people themselves could overwhelm any number of troops sent to contain them.
"The militia, who are in fact the effective part of the people at large, will render many troops quite unnecessary. They will form a powerful check upon the regular troops, and will generally be sufficient to over-awe them"
Tench Coxe, An American Citizen IV, October 21, 1787
Between the founding up through about 1890 (and later in the west) the carrying of firearms for protection was a routine matter and little notice was taken of a man or woman carrying a gun with them. Most were worn openly in holsters, though women frequently had a small pistol in a purse or concealed under a cloak or coat so as to appear more like a lady of breeding.
This means firearms - handguns and long guns - have always been prevalent in American life since the founding. Mostly carried openly and most were never used to kill another person, but to serve as a warning to criminals and as a symbol of a free man.
As Jefferson wrote to his nephew, Peter Carr in 1785, that while the gun
gives a moderate exercise to the Body, it gives boldness, enterprise, and independence to the mind... . He could hardly have said these words if he believed in an official militia-control of their arms.