Final answer:
The executive and judicial branches have expanded their powers by interpreting the Constitution and exercising their responsibilities.
Step-by-step explanation:
The executive branch and the judicial branch of the United States have expanded their powers since the US Constitution was written.
Executive Branch: Over the course of the twentieth century, presidents have interpreted the vague wording in Article II to justify actions beyond those specifically mentioned in the Constitution. They have expanded their power by growing agencies like the Secret Service and developing the concept of executive privilege.
Judicial Branch: The judicial branch's power has expanded through the use of judicial review. The Supreme Court's decisions, such as allowing random drug testing in public high schools, have increased its influence and authority.
Conclusion: The executive branch and the judicial branch have expanded their powers through the interpretation of the Constitution and the exercise of their responsibilities.