A number of things in different cases. You will have to be more specific.
No.
(Supreme Court)
Supreme Court
A court would declare a state law unconstitutional if they believe it goes against the "un alienable rights" of the constitution
Yes, the Utah supreme court rules that the ban on same sex marriages was unconstitutional.
It is not unconstitutional. The Supreme Court ruled that it is constitutional.
No. Only the President of the United States can do this. However, when a law is enacted, and then challenged in the court system, it may be appealed all the way up to the Supreme Court where it may then be ruled unconstitutional.
It allowed the Supreme Court to overrule an unconstitutional law.
the supreme court can declare laws unconstitutional
Declared unconstitutional by the supreme court
The Supreme Court gained the power to declare laws unconstitutional
They can appeal to the United States Supreme Court to have the law be declared unconstitutional by the Supreme Court's right to judicial review.
It was a concept of judicial review. In other words the supreme court have the authority to review other branches of court and decide whether or not the cases are unconstitutional.