Briefly explain how one of the presidents described in this section defined or exercised the powers of the presidency

The main exercised power of the presidency is:

The Constitution explicitly assigns to the president the power to sign or veto legislation, command the armed forces, ask for the written opinion of his or her Cabinet, convene or adjourn Congress, grant reprieves and pardons, and receive ambassadors.

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The answer is william henry harrison pursued and defeated british forces retreating into canada.