AP Human Geography – Gerrymandering and Electoral Geography

AP Human Geography – Gerrymandering and Electoral Geography

AP Human Geography Study Guide: Gerrymandering and Electoral Geography

What This Is

Gerrymandering is the deliberate manipulation of electoral district boundaries to favor one political party, group, or incumbent. It’s a key concept in electoral geography—the study of how spatial patterns influence political outcomes. This topic matters on the AP exam because it tests your ability to analyze maps, understand political power dynamics, and apply concepts like reapportionment and redistricting. A famous example is Elbridge Gerry’s 1812 Massachusetts district, shaped like a salamander (hence "gerrymander"), which was drawn to benefit his party.

Key Terms & Concepts

• Gerrymandering: Redrawing electoral district boundaries to give one party an unfair advantage. Example: North Carolina’s 12th District (2016), a thin, winding district designed to pack Black voters into one district.
• Redistricting: The process of redrawing electoral district boundaries after each census (every 10 years in the U.S.).
• Reapportionment: Reallocating seats in the U.S. House of Representatives based on population changes from the census.
• Cracking: Spreading opposition voters across multiple districts to dilute their voting power.
• Packing: Concentrating opposition voters into as few districts as possible to limit their influence elsewhere.
• Majority-Minority District: A district where a racial or ethnic minority group makes up the majority of voters, often created to comply with the Voting Rights Act (1965).
• Efficiency Gap: A formula measuring wasted votes (votes beyond what’s needed to win or votes for a losing candidate). Formula: (Total wasted votes for Party A – Total wasted votes for Party B) / Total votes cast.
• Compactness: A principle that districts should be geographically compact (not oddly shaped). Example: Iowa’s nonpartisan redistricting process prioritizes compactness.
• Partisan Symmetry: The idea that election outcomes should reflect the overall vote share (e.g., if Party A gets 60% of votes, they should win ~60% of seats).
• Voting Rights Act (VRA) of 1965: Federal law prohibiting racial discrimination in voting, often requiring majority-minority districts.
• Baker v. Carr (1962): Supreme Court case establishing that federal courts can intervene in redistricting disputes ("one person, one vote").
• Shaw v. Reno (1993): Supreme Court case ruling that racial gerrymandering is unconstitutional unless justified by a "compelling state interest."

Step-by-Step / Process Flow

How to Analyze a Gerrymandered District on the AP Exam:

1. Examine the District Shape → Is it oddly shaped (e.g., long, thin, or disconnected)? If yes, it’s likely gerrymandered.
2. Check Voter Demographics → Are voters of one party or race packed into a single district? This suggests packing.
3. Compare Vote Share to Seats Won → If a party wins 50% of the statewide vote but 70% of seats, gerrymandering is likely.
4. Apply the Efficiency Gap Formula → Calculate wasted votes to measure partisan bias.
5. Wasted votes = Votes beyond 50% + 1 (for winners) OR all votes (for losers).
6. Consider Legal Context → Does the district comply with the VRA (majority-minority districts) or violate Shaw v. Reno (racial gerrymandering)?
7. Propose a Fairer Alternative → Suggest compact, contiguous districts that follow natural boundaries (e.g., rivers, highways).

Common Mistakes

• Mistake: Assuming all oddly shaped districts are gerrymandered.
  Correction: Some districts follow natural boundaries (e.g., rivers) or comply with the VRA (majority-minority districts). Example: Illinois’ 4th District is "earmuff-shaped" to unite Hispanic communities but is legally justified.

• Mistake: Confusing reapportionment (reallocating House seats) with redistricting (redrawing district lines).
  Correction: Reapportionment happens first (after the census), then states redistrict.

• Mistake: Thinking gerrymandering only benefits one party.
  Correction: Both parties gerrymander when they control state legislatures. Example: Maryland (Democrats) and Wisconsin (Republicans) have both been accused of partisan gerrymandering.

• Mistake: Assuming majority-minority districts are always fair.
  Correction: They can pack minority voters, reducing their influence in other districts. Example: North Carolina’s 12th District was struck down for racial gerrymandering in 2017.

• Mistake: Ignoring the efficiency gap in favor of just looking at district shapes.
  Correction: The efficiency gap quantifies gerrymandering mathematically, even if districts look "normal."

AP Exam Insights

• FRQ Focus: Expect a map-based FRQ where you analyze district boundaries, explain gerrymandering techniques (cracking/packing), and discuss legal/ethical implications.
• Multiple-Choice Traps:
• ⚠️ Distinguishing between racial and partisan gerrymandering (VRA compliance vs. partisan bias).
• ⚠️ Assuming all majority-minority districts are gerrymandered (some are legally required).
• ⚠️ Forgetting that redistricting happens after reapportionment (not the other way around).
• Key Court Cases: Know Baker v. Carr (federal courts can intervene) and Shaw v. Reno (racial gerrymandering is unconstitutional).
• Real-World Connection: The AP exam loves North Carolina, Texas, and Wisconsin as gerrymandering case studies.

Quick Check Questions

1. Which of the following is the BEST example of "packing" in gerrymandering?
   (A) Splitting a city’s Democratic voters across three Republican-leaning districts
   (B) Drawing a district that unites rural Republican voters across multiple counties
   (C) Concentrating 80% of a state’s Black voters into one district to limit their influence elsewhere
   (D) Creating districts that follow natural boundaries like rivers
   Answer: (C) Packing involves concentrating opposition voters into as few districts as possible.

2. The efficiency gap measures gerrymandering by calculating:
   (A) The number of oddly shaped districts in a state
   (B) The difference in wasted votes between two parties
   (C) The percentage of minority voters in a district
   (D) The compactness of a district using geometric formulas
   Answer: (B) The efficiency gap compares wasted votes (votes beyond what’s needed to win or votes for losing candidates).

3. Short FRQ: The map below shows a congressional district in Texas. Identify ONE gerrymandering technique used in this district and explain how it benefits a political party.
   Sample Answer: This district uses "packing" by concentrating Democratic voters (likely urban minorities) into a single, oddly shaped district. This limits their influence in surrounding districts, benefiting the Republican Party.

Last-Minute Cram Sheet

1. Gerrymandering = manipulating district boundaries for political gain.
2. Cracking = spreading opposition voters thin; packing = concentrating them.
3. Reapportionment → Redistricting (order matters!).
4. Efficiency Gap = (Wasted Party A votes – Wasted Party B votes) / Total votes.
5. VRA (1965) requires majority-minority districts in some cases.
6. Baker v. Carr (1962) = "one person, one vote" (federal courts can intervene).
7. Shaw v. Reno (1993) = racial gerrymandering is unconstitutional.
8. Compactness = districts should be geographically logical (not salamander-shaped).
9. Partisan symmetry = election outcomes should match vote share.
10. ⚠️ Not all odd districts are gerrymandered—some follow natural boundaries or VRA rules!