What can be done once a State supreme Court has made a decision?

Answer 1

You can appeal to the Federal District court. You cannot go directly to the US Supreme Court. But unless there is a compelling federal issue at state such as a constitutional violation by the state courts it is hopeless.

Answer 2

Usually nothing. Unless the ruling involves some question of the Federal Constitution or statutes, thats probably the end of things. If it does involve a Federal matter, then you can attempt to appeal to the U.S. Supreme Court, and your odds of the Court granting a writ and even hearing it are about 1 in 10000.

Answer 3

appeal to federal court.