What provisions in the US Constitution make it a flexible documentation?

The provision that provides flexibility to the U.S.Constitution is Article 5, which established procedures for proposing and ratifying amendments to the Constitution. Article 3 established the Supreme Court and the power of judicial review. It does not grant the Court the power to interpret the Constitution. However, in the 1803 case Marbury vs. Madison the Supreme Court determined that it had the right to interpret the Constitution, thus lending flexibility to the Constitution. -- Contributed by Ray Kovach, Chicago, IL