Final answer:
The President's power to veto an act of Congress illustrates the system of checks and balances.
Explanation:
The President's power to veto an act of Congress is an example of the system of checks and balances. Checks and balances are mechanisms in place to prevent any branch of government from becoming too powerful. In this case, the President's veto power serves as a check on the legislative branch's ability to pass laws without accountability.
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