Yes it is. The law only makes it illegal to sell them, and by implication, illegal to carry them concealed on one's person.
Because it is illegal to sell them in Maryland, and because Federal law makes it illegal to sell them over state lines, the only way to obtain a switchblade for a Maryland resident is to travel to another state where it is not illegal to sell or possess switchblades.
Under federal law of America It is illegal to own any spring loaded projectile in the knife category.
Yes
yes it is
You can own them, you just can't carry them.
It's legal if its under 1.5 inches
No, it is not illegal to own lock picks in Carolina. That said, when in doubt consult the police or an attorney.
From what I have read (the knife laws section of NC) you cannot posses a switchblade at all in America but you are allowed to own a butterfly knife as long as it's on YOUR OWN premises
No it is not. All cats must be under 8 pounds.
You need to talk to a lawyer for a current, correct and legal answer.
Upon marriage or upon becoming 18 years of age.
Yes they are. They're legal in 46 of the 48 states, Pennsylvania and California being the exceptions.
North Carolina is its own state.
If it is your own, certainly not.
Yes. For example, Native Americans live in Cherokee North Carolina, which is located in Western North Carolina. They even have their own casino.