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AP US Government & Politics — Cheatsheet

Formulas, exam-day tips, and key terms on one page.

On the exam

When a free-response prompt names a foundational document, do not just summarize it — **apply its argument** to the scenario. For Federalist 10, name factions and the large-republic remedy; for Brutus 1, name the fear of a distant, consolidated government and the small-republic ideal.
Pair the cases as a contrast: **McCulloch expanded** federal power (implied powers + supremacy), while **Lopez limited** it (commerce power has bounds; reserved powers matter). Free-response prompts love asking you to compare a required case with a non-required one, so know which direction each pushed.
Anchor the House–Senate contrast on **debate**: the House limits it (Rules Committee, majority rules), the Senate does not (filibuster, cloture needs 60). Many exam items reduce to which chamber’s rules apply, so lead with that distinction.
Link the documents to the cases: **Federalist 78** theorizes judicial review and the "least dangerous branch," and **Marbury v. Madison** makes it real. If a prompt asks how the judiciary became co-equal despite lacking sword or purse, cite both together.
On accountability questions, name a check for each branch: **Congress** (funding + oversight hearings + rewriting the law), **president** (appointments + executive orders), **courts** (reviewing agency actions). Listing all three earns broader credit than naming just one.
Sort the First Amendment cases by clause: **Engel** (Establishment), **Yoder** (Free Exercise), **Tinker** (symbolic speech), **Schenck** (limits on speech — clear and present danger), **NYT v. US** (press, no prior restraint). Naming the clause and the standard together earns the point.
Both **Gideon** (right to counsel) and **McDonald** (right to bear arms) are incorporation cases decided under the **Fourteenth Amendment**. If a prompt asks how a Bill of Rights protection came to bind a *state*, "selective incorporation through the Due Process Clause" is your framework.
Keep the concepts distinct: **civil liberties** are freedoms *from* government interference (speech, religion, due process); **civil rights** are protections *by* government against discrimination (equal protection). Brown and the Equal Protection Clause are civil *rights*; the First Amendment cases are civil *liberties*.
When a prompt describes shared beliefs, reach for the core-values list — **individualism, equality of opportunity, free enterprise, rule of law, limited government**. Naming the specific value (not just "American values") is what earns credit.
On poll-interpretation items, always compare the candidates’ gap to the **combined margin of error**. If the lead is smaller than (or within) the margin, call it a **statistical tie** — that phrase is frequently the intended answer.
Watch the two axes separately: a person can be economically conservative but socially liberal, or vice versa. When a prompt describes a stance, ask whether it is about the **economy** or **social/moral** issues before assigning a label.
Pair the districting cases: **Baker v. Carr** opened the courthouse door (justiciability → one person, one vote), and **Shaw v. Reno** limited *racial* gerrymandering (strict scrutiny). Prompts often ask you to distinguish which case did which — keep them separate.
Distinguish the money types cleanly: **direct contributions** to candidates are **limited**; **independent expenditures** (post-Citizens United, often via **Super PACs**) are **unlimited** but must not be coordinated with the campaign. Exam items frequently test the "independent and uncoordinated" condition.
Keep the media roles distinct: **gatekeeper** (what gets covered), **watchdog** (exposing wrongdoing), **agenda-setter** (what the public treats as important), **framing** (how an issue is portrayed). Scenario questions usually map cleanly onto one of these four terms.

How to get a 5

For SCOTUS comparison FRQs, always identify the constitutional clause or amendment that links the two cases.
Understand the difference between civil liberties and civil rights.
When discussing federalism, use terms like mandates and grants-in-aid.
Remember that the President's informal powers are often more frequently used than formal powers.
The MCQ section rewards knowing what each required case did NOT do. For every one of the fifteen required cases, write one sentence naming the clause at issue and the specific rule announced. Most wrong answers on this exam are true statements about a different case — Miranda offered as Gideon, Heller offered as McDonald, Reynolds offered as Baker.
Concept Application is scored line by line, so mirror the verbs. "Describe" needs a specific feature, "explain" needs a because clause, and every part after A must be tied to the stimulus by name. A correct definition that never mentions the senator, agency, or bill in the scenario earns zero.
For SCOTUS Comparison, the point students lose most often is stating the required case’s reasoning rather than just its outcome. Practice saying, in one sentence, the rule and why the facts satisfied it: "In Tinker, symbolic speech was protected because the armbands caused no material and substantial disruption." Then the comparison writes itself from the fact difference.
Argument Essay evidence must be described, not merely cited. Writing "as Federalist No. 10 shows" earns nothing; writing "Madison argues the causes of faction cannot be removed without destroying liberty, so a large republic must control their effects" earns the point. Memorize two usable sentences from Federalist 10, 51, 70, and 78 plus Brutus No. 1.
Build a quantitative-analysis habit before test day: for any table or graph, say the trend out loud, name the units, and identify the one comparison the question is actually asking for. Points are lost by describing the data without connecting it to a political science concept such as polarization, turnout, or split-ticket voting.

Key terms

Federalism — A system of government in which power is divided between a central (national) government and regional (state) governments.

Tenth Amendment — Reserves to the states or the people powers not delegated to the federal government. The textual anchor of states' rights arguments.

Commerce clause — Gives Congress power over interstate commerce. Read broadly since Gibbons and especially since the New Deal; narrowed somewhat in US v. Lopez.

Necessary and proper clause — Grants Congress power to make laws needed to execute its enumerated powers. The constitutional basis of most federal expansion.

Stare Decisis — The legal principle of determining points in litigation according to precedent.

Judicial review — The power to strike down laws and acts as unconstitutional. Not in the Constitution's text; established in Marbury v. Madison.

Filibuster — A procedural practice in the Senate to delay or prevent a vote.

Cloture — A procedure for terminating debate, especially filibusters, in the Senate.

Gerrymandering — Drawing district lines for partisan advantage. "Packing" concentrates opponents in few districts; "cracking" splits them across many.

Incumbency advantage — Sitting members win re-election at very high rates, helped by name recognition, casework, fundraising and often friendly district lines.

Iron triangle — The stable alliance of a congressional committee, an agency and an interest group, each supplying something the other two need.

Selective incorporation — Applying Bill of Rights protections to the states one at a time through the Fourteenth Amendment's due process clause.

Declaration of Independence (1776) — core argument — Natural rights (life, liberty, pursuit of happiness) come before government; government exists by consent of the governed to secure those rights; when it becomes destructive of them, the people may alter or abolish it. Jefferson drew on Locke’s social contract.

Articles of Confederation — three fatal weaknesses — No power to tax (only request funds from states), no national army or executive to enforce law, and amendment required unanimous consent of all 13 states. A one-house Congress with one vote per state; Shays’ Rebellion (1786–87) exposed the design and triggered the Philadelphia Convention.

Federalist No. 10 — thesis in one line — Madison: factions are inevitable because liberty produces them, so control their effects, not their causes; a large (extended) republic with representation makes an oppressive majority faction harder to assemble.

Brutus No. 1 — thesis in one line — Anti-Federalist warning that the necessary and proper and supremacy clauses give the national government unlimited reach, and that a republic covering so vast and diverse a territory cannot represent the people or preserve liberty.

Federalist No. 51 — thesis in one line — Madison: "Ambition must be made to counteract ambition." Separation of powers plus checks and balances gives each branch the constitutional means and personal motive to resist the others, since a government of men cannot rely on virtue alone.

Federalist No. 70 — thesis in one line — Hamilton: a single executive provides "decision, activity, secrecy, and despatch," and — crucially — accountability, because a plural executive lets officials hide responsibility behind one another.

Federalist No. 78 — thesis in one line — Hamilton: the judiciary is the "least dangerous" branch because it has "neither force nor will, but merely judgment"; life tenure and judicial review let judges defend the Constitution against legislative overreach.

Letter from Birmingham Jail (1963) — key claims — King defends nonviolent direct action: "injustice anywhere is a threat to justice everywhere"; unjust laws (those a majority imposes on a minority without binding itself) carry a moral duty of civil disobedience; the white moderate who prefers order to justice is a greater obstacle than the outright racist.

The Constitution — the four formal amendment routes and the common one — Proposal by two-thirds of both houses of Congress OR by a national convention called by two-thirds of state legislatures; ratification by three-fourths of state legislatures OR three-fourths of state conventions. All but the 21st Amendment used congressional proposal plus state legislature ratification.

Selective incorporation — definition and vehicle — The case-by-case application of Bill of Rights protections to state and local governments through the Fourteenth Amendment’s due process clause. Examples: Gitlow (speech, 1925), Gideon (counsel, 1963), McDonald (arms, 2010).

Federalism tools: categorical vs. block grants and mandates — Categorical grants fund a narrow purpose with strict conditions (maximum federal leverage); block grants fund a broad area with state discretion; unfunded mandates require state action without paying for it (e.g., portions of the Americans with Disabilities Act).

Enumerated vs. implied vs. reserved powers — Enumerated: listed in Article I, Section 8 (coin money, declare war). Implied: derived from the necessary and proper clause (national bank, per McCulloch). Reserved: left to the states by the Tenth Amendment (education, most criminal law, licensing).