The decision was taken by the US Supreme Court in the case Marbury v. Madison makes the US democracy more stable.
In this case, Marbury v. Madison the US Supreme Court declared that is the job of the US Supreme Court to rule if a law is constitutional or not. This puts limits on the Congress power and it is one of the limits given to the judiciary branch by the checks and balances system. This makes democracy more stable because the Constitution is the base of everything and it will be preserved.