[SllX]

There you go making generalizations about 50 separate sovereign entities with 50 different legislatures, constitutions and court systems independent of each other.

But yes, legislatures can change laws on a whim, which is quite a bit more of a process than when I do something on a whim. Given the half-a-hundred entities that are the subject of your comment, some variability in the laws and political processes creating different outcomes depending on their jurisdiction is an expected result.