I would want all guns to be held at a centre so that those Americans who rely on a long heritage of using guns can continue to do so, but without the risk of anyone, including their own family, from accessing a gun. It is too risky.
Furthermore, those who leave the military may have post traumatic stress and it is dangerous for them to possess guns. More care needs to be taken about tracking guns provided to servicemen once they leave the field of action and particularly, when they leave the military service.
One thing that I would change about America if I could - giving everyone the democracy to vote. If the person would vote, let it be cast as one vote instead of the usual wherein the whole state would be determined before making a decision. There are a lot of things that can be changed about America but it will always change from one person to another.
There are some people who wish that America would have a more precise public transportation system. It can be easy to acquire vehicles in America and this has contributed to traffic and not a lot of people using public transportation. If this could be changed then America might become eco-friendly as carbon dioxide emissions will be greatly reduced.