The Judicial Branch has the power of Judicial Review. What is Judicial Review?

Judicial review is the power of courts to decide the validity of acts of the legislative and executive branches of government. If the courts decide that a legislative act is unconstitutional, it is nullified. ... The power was first asserted by Chief Justice John Marshall in 1803, in the case of Marbury v. Madison.

Second, due to its power of judicial review, it plays an essential role in ensuring that each branch of government recognizes the limits of its own power. Third, it protects civil rights and liberties by striking down laws that violate the Constitution.

demand is the need and oportunity to buy a given good or service.

because its important to learn about other countries and how high tech they are compared to us. also its good to learn about other cultures and how ours differs and in common also we need to learn about companies that we still buy since they ship it here.