When the Supreme Court says a law is unconstitutional it means?

If a court decides that something — a law, an appointment, and an action — is unconstitutional, they are — on the face of it — saying it is a legal nothing. Sometimes that is reasonably straightforward. Eight sections of the Security Laws (Amendment) Act, 2014, were declared unconstitutional early in 2015. The new rules had not been applied, so no complications were caused by ruling that they had no legal effect.

considered the turning point in pacific war. the japanese tried to lure the american navy out so it could be destroyed but failed. the americans were led by admiral chester nimitz. the victory by america would put them on the offensive for the remainder of the war.