It means that States right have no power period. Dont know why people are happy this is a lose not a win.Ha! Great question. Who knows. At a minimum, it means that blanket bans on handgun posession in the home are struck down everywhere, and it means a lot of subsequent challenges testing the limits of the constitutionality of state/local laws' restricting guns in various ways will be filed, and hashed out for decades and decades to come.
It shows that the States have no power what so ever. Sorry to rain on your parades but while people are clapping, your clapping away your 10th amendment as well.
Chitown gun ban was Chittown and Illinois's business had nothing to do with the Supreme Court or our gun rights.
With out the other rights in place the 2A is useless as well.