Electoral Geography and Gerrymandering

Active learning works for this topic because students need to physically manipulate district boundaries to see how geography and demographics interact with political power. Mapping exercises make abstract legal concepts like 'cracking' and 'packing' concrete, turning what could be a dry civics lecture into a tangible problem-solving experience that mirrors real-world redistricting decisions.

• 12th Grade
• Geography
• 4 activities
• 20 min–50 min

Learning Objectives

1. Analyze how population density and demographic distribution influence electoral district boundaries and voting outcomes.
2. Explain the mechanisms of cracking and packing as gerrymandering techniques and their political consequences.
3. Critique the effectiveness of various redistricting methods, such as independent commissions or mathematical algorithms, in achieving fair representation.
4. Compare and contrast the legal arguments and outcomes of landmark Supreme Court cases related to gerrymandering, such as Rucho v. Common Cause.

Simulation Game

⏱ 50 min·Small Groups

Simulation Game: Draw the District

Students receive a hypothetical state with demographic data and must draw four congressional districts two ways: once to favor Party A, once to meet fairness criteria. Small groups compare maps and debate which criteria matter most.

Prepare & details

Analyze how population distribution influences electoral outcomes.

Facilitation Tip: During the Simulation: Draw the District activity, circulate with colored pencils and pre-printed population data so students can physically trace where blocs split or merge under different scenarios.

Setup: Flexible space for group stations

Materials: Role cards with goals/resources, Game currency or tokens, Round tracker

• Apply
• Analyze
• Evaluate
• Create
• Social Awareness
• Decision-Making

Jigsaw

⏱ 40 min·Small Groups

Jigsaw: Landmark Redistricting Cases

Groups each receive one major US redistricting case , Gill v. Whitford, LULAC v. Perry, or Rucho v. Common Cause , and prepare a brief on the geographic and legal issues at stake. Groups then share findings in a structured round-robin.

Prepare & details

Explain the process and political implications of gerrymandering.

Facilitation Tip: In the Case Study Jigsaw, assign clear roles (e.g., historian, lawyer, geographer) so each student contributes a distinct lens to the group’s analysis of landmark cases.

Setup: Flexible seating for regrouping

Materials: Expert group reading packets, Note-taking template, Summary graphic organizer

• Understand
• Analyze
• Evaluate
• Relationship Skills
• Self-Management

Problem-Based Learning

⏱ 30 min·Pairs

Data Analysis: The Efficiency Gap

Students use simple vote-share data from two hypothetical districts to calculate the efficiency gap metric, then debate whether a mathematical formula can capture electoral fairness. They compare results across several sample maps.

Prepare & details

Critique different methods for drawing electoral districts to ensure fair representation.

Facilitation Tip: For the Data Analysis: The Efficiency Gap activity, project the spreadsheet formula on the board and walk through one calculation step-by-step so students see how the metric quantifies partisan bias.

Setup: Groups at tables with access to research materials

Materials: Problem scenario document, KWL chart or inquiry framework, Resource library, Solution presentation template

• Analyze
• Evaluate
• Create
• Decision-Making
• Self-Management
• Relationship Skills

Think-Pair-Share

⏱ 20 min·Pairs

Think-Pair-Share: Independent Redistricting Commissions

Students read a short overview of California's Citizens Redistricting Commission and Iowa's legislative redistricting model. Pairs discuss whether independent commissions produce fairer maps than legislatures drawing their own lines.

Prepare & details

Analyze how population distribution influences electoral outcomes.

Facilitation Tip: During the Think-Pair-Share on Independent Redistricting Commissions, provide a two-column graphic organizer with pros and cons to scaffold students’ arguments before the full-class discussion.

Setup: Standard classroom seating; students turn to a neighbor

Materials: Discussion prompt (projected or printed), Optional: recording sheet for pairs

• Understand
• Apply
• Analyze
• Self-Awareness
• Relationship Skills

Teaching This Topic

Teachers should treat this topic as a balance between civic engagement and analytical rigor. Avoid presenting gerrymandering as purely partisan; instead, frame it as a structural problem where geography, law, and politics collide. Use the Supreme Court’s shifting standards (from Baker v. Carr to Rucho) to show students how judicial decisions shape what mapmakers can legally do, emphasizing that fairness is contested, not self-evident.

What to Expect

Students will demonstrate their understanding by accurately applying gerrymandering techniques to maps, citing legal precedents in case discussions, and articulating trade-offs between fairness criteria like compactness and partisan advantage. Success looks like students fluently debating redistricting criteria using both geographic data and legal reasoning.

Watch Out for These Misconceptions

Common Misconception

During the Case Study Jigsaw activity, watch for students assuming all gerrymandering is illegal.

What to Teach Instead

Use the jigsaw’s case packets to highlight Rucho v. Common Cause (2019), which upheld partisan gerrymandering as legal but struck down racial gerrymandering in cases like Shaw v. Reno; have students annotate the cases with the specific legal standards that distinguish the two.

Common Misconception

During the Simulation: Draw the District activity, watch for students equating compact shapes with fairness.

What to Teach Instead

Have students compare two compact maps: one that splits a minority community across three districts (cracking) and another that concentrates them into one district (packing), then ask them to calculate the Efficiency Gap for each to see how shape alone doesn’t guarantee equity.

Assessment Ideas

Exit Ticket

After the Simulation: Draw the District activity, have students complete an index card defining 'cracking' and 'packing' in their own words, drawing a quick sketch of each technique on the back of the map they created during the simulation.

Discussion Prompt

During the Think-Pair-Share on Independent Redistricting Commissions, listen for students citing evidence from the Case Study Jigsaw to support their arguments in the debate about redistricting criteria, ensuring their positions are grounded in both legal precedents and geographic principles.

Quick Check

After the Data Analysis: The Efficiency Gap activity, present students with two sample district maps and ask them to circle which map is more likely gerrymandered, then write a sentence explaining how the Efficiency Gap calculation or demographic data led them to that conclusion.

Extensions & Scaffolding

• Challenge: Ask students to redesign a state map using the Efficiency Gap calculator until they achieve a score within 2% of zero, then defend their map’s legitimacy in a one-page memo.
• Scaffolding: Provide a partially drawn district map with pre-labeled demographic clusters and ask students to finish the remaining lines while avoiding cracking or packing.
• Deeper Exploration: Invite a local election official or redistricting expert to discuss how their state’s commission operates and what data they prioritize when drawing lines.

Key Vocabulary

Gerrymandering	The manipulation of electoral district boundaries to favor one party or group over another, often resulting in disproportionate representation.
Cracking	A gerrymandering technique that divides a cohesive voting bloc across multiple districts, diluting its influence in each.
Packing	A gerrymandering technique that concentrates a specific voting bloc into a single district, maximizing its representation there but minimizing its influence elsewhere.
Compactness	A principle of district drawing that favors shapes that are roughly square or circular, minimizing irregular borders and contiguity.
Contiguity	The requirement that all parts of a district must be connected, so that a voter can travel from any point within the district to any other point without leaving the district.