This is bad law, long since overturned by Scalia's write-up of Heller v. DC.The various State Militia's were under the command of and could be called to duty by the President.
Actually, state militias are never under the command of the President, unless specifically called up by the federal government.
It is only recently that the courts held that an individual has the right to own a gun for protection. That could be taken away by another court decision in the future. Which is why I'd liken to see a new amendment to clearly define those rights.
This is ignorant. Just because something is said for the first time does not mean that only became true at that time. The right to bear arms has always included any lawful purpose for bearing arms. The right to self defense has always been a lawful purpose for bearing arms. This predates our constitution as part of the English common law.
United States vs. Cruikshank (1875)
The United States v. Cruikshank was the Second Amendment's first real test under the incorporation doctrine. For gun owners, Cruikshank marked the start of more than a century of unchecked regulation by the states.
The case arose during a disputed gubernatorial election between Reconstruction Republicans and Democrats in Louisiana. Both the Democratic and Republican candidates for governor claimed victory. President Ulysses S. Grant sent in federal troops to support the Republican government, but Democrats refused to acknowledge their loss.
The state's nearly all-black militia gathered at the Colfax County courthouse to prevent the Democratic candidates from assuming local offices. Members of the White League, an armed paramilitary group of white Democrats, attacked and killed more than a hundred militiamen, an event which became known as the Colfax County Massacre.
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The Court held in United States v. Cruikshank that the individual had no inherent Second Amendment rights. For more than a hundred years, this interpretation of the Second Amendment would go largely unchallenged. An individual's right to bear arms would be left up to the states, to allow or restrict as they deemed fit.
The Supreme Court's Impact on the Second Amendment
Your knowledge is bad.
You did not read on nor read carefully. You quoted superseded law, such as Dred Scott.