Which principle was where the supreme court declares a law unconstitutional

Judicial Review is the principle wherein the Supreme Court has the power to review laws and declare the laws to be constitutional or unconstitutional. Constitutional scholars trace the principle of judicial review back to the SCOTUS case Marbury v. Madison.

The judicial branch.It includes the judging.Tip u can remeber judicial and judge.

well it depends i think people around the world are coming around to gay marriage. but if you are talking abortion then wow, so much to talk about. such as men thinking they have the right to choose if women can, the fact there are health concerns if the women can't get one, and many more arguments to discuss. so i would definitely say abortion would be a much more interesting topic.