Final answer:
In cases involving judicial review, courts have more often found governmental actions to be constitutional than not. The power of judicial review is exercised sparingly, with the Supreme Court striking down a small percentage of laws over its history.
Step-by-step explanation:
In the context of judicial review, when courts assess whether governmental actions are consistent with the Constitution, they have most often found the actions to be constitutional. As part of the system of checks and balances, judicial review is a critical function that allows the judiciary to evaluate the actions of the legislative and executive branches at both the federal and state levels. The courts do not frequently declare government actions unconstitutional; in fact, in its history, the Supreme Court has struck down a relatively small number of national and state laws compared to the total number legislated.
However, when actions are found to be in violation of the Constitution, the judiciary has the power to deem them null and void. This was established in the landmark case Marbury v. Madison and is integral to the court's ability to oversee the other branches of government and safeguard constitutional governance.