Final answer:
The constitutional principle of checks and balances is illustrated in the statements: the Senate approving presidential nominations to the Supreme Court, the Supreme Court declaring laws made by Congress unconstitutional, and the national government sharing power with state governments.
Step-by-step explanation:
The constitutional principle of checks and balances is illustrated in the following statements:
- The Senate must approve presidential nominations to the Supreme Court. This demonstrates a check on the executive branch's power to appoint judges, as the Senate acts as a check by having the authority to approve or reject nominations.
- The Supreme Court can declare laws made by Congress unconstitutional. This illustrates the judiciary's power to check the legislative branch's authority by determining the constitutionality of laws.
- The national government shares power with the state governments. This represents a check on the federal government's power, as the division of power between the national government and state governments ensures a balance of authority.