Describe the constitutional powers and roles of the presidency, the executive bureaucracy, and the limits on presidential power.
Article II vests "the executive Power" in a single president, elected to a four-year term (and, since the Twenty-Second Amendment in 1951, limited to two elected terms). To be eligible, a person must be at least 35 years old, a natural-born citizen, and a resident of the United States for at least fourteen years. The president wears several distinct constitutional "hats." As chief executive, the president enforces and administers the laws Congress passes. As commander-in-chief, the president leads the armed forces, though the Constitution deliberately splits war power: only Congress can formally declare war, while the president directs military operations once forces are committed. As chief diplomat, the president negotiates treaties (which need two-thirds Senate approval) and can make executive agreements with other nations alone, without Senate approval. As a legislative actor, the president can veto bills, delivers an annual State of the Union address, and proposes a legislative agenda, even though only Congress can actually pass laws.
Because one person cannot run a government of millions of employees alone, the president oversees a vast executive bureaucracy: fifteen cabinet departments (State, Defense, Treasury, and others) plus dozens of independent agencies, all responsible for implementing and enforcing the laws Congress writes, so large and influential that political scientists sometimes informally call it a "fourth branch" of government. Presidential power is checked in several ways: the Twenty-Second Amendment caps a president at two elected terms; the House can impeach a president for "Treason, Bribery, or other high Crimes and Misdemeanors," and the Senate can then convict and remove with a two-thirds vote; Congress controls funding for executive programs; and courts can review the legality of executive actions. One tension has never fully resolved: presidents since World War II have repeatedly committed U.S. forces to combat without a formal congressional declaration of war, citing their commander-in-chief power, while Congress passed the War Powers Resolution in 1973 attempting to limit such actions -- presidents of both parties have used this practice and disputed the Resolution's limits, making it a genuine, ongoing constitutional tension between the branches rather than a settled question.
Mastery looks like: They can list the constitutional qualifications for president, name and give an example of each presidential role (chief executive, commander-in-chief, chief diplomat, legislative actor), and explain the ongoing tension over war powers.
Common stumbles: Assuming the president can unilaterally declare war, or confusing a treaty (needs Senate approval) with an executive agreement (does not).