Geography · 9th Grade · Population and Migration · Weeks 10-18

Internal Migration in the United States

Analyzing historical movements like the Great Migration and the shift to the Sun Belt.

• Common Core State Standards
• C3: D2.Geo.7.9-12
• C3: D2.His.3.9-12

About This Topic

Internal migration has reshaped the United States more than once. The Great Migration, which unfolded in two waves between 1910 and 1970, saw roughly six million Black Americans leave the rural South for industrial cities in the North and West, fundamentally changing the demographics of cities like Chicago, Detroit, and New York. Separately, the post-World War II expansion of the Sun Belt drew millions toward the South and Southwest, a trend that only accelerated with widespread air conditioning after the 1950s. Before mechanical cooling, the summer heat of states like Arizona and Florida made large populations practically unsustainable; air conditioning shifted that calculus entirely.

Today's internal migration reflects a newer set of forces. The Rust Belt, built on steel and automotive manufacturing, has lost population steadily as those industries contracted. Meanwhile, lower housing costs, remote work flexibility, and warmer climates are pulling families from legacy northern cities toward states like Texas, Florida, Tennessee, and Georgia.

Active learning fits this topic well because students can map their own families' migration histories alongside national patterns, connecting personal experience to structural forces like economic change and climate geography.

Key Questions

1. Explain how the invention of air conditioning changed US population distribution.
2. Analyze why people are currently moving from the Rust Belt to the South and West.
3. Predict the consequences of rural-to-urban migration in America.

Learning Objectives

• Analyze the primary push and pull factors that drove the Great Migration of Black Americans from the rural South to Northern and Western cities.
• Evaluate the impact of air conditioning technology on population shifts towards the Sun Belt states after World War II.
• Compare the economic and environmental reasons for contemporary migration from the Rust Belt to the South and West.
• Predict potential social and economic consequences of increasing rural-to-urban migration within the United States.

Before You Start

US Regional Geography

Why: Students need a foundational understanding of the different regions of the United States, including the Northeast, South, Midwest, and West, to comprehend migration patterns between them.

Industrial Revolution and Economic Change

Why: Understanding the impact of industrialization on job availability and urbanization is crucial for analyzing historical migrations like the Great Migration.

Key Vocabulary

Great Migration	The large-scale movement of six million Black Americans from the rural South to cities in the North, Midwest, and West between 1910 and 1970.
Sun Belt	A region of the United States generally extending across the southern and southwestern states, characterized by a warmer climate and significant population growth.
Rust Belt	A region in the northeastern and midwestern United States that is characterized by declining industry, aging factories, and population loss.
Push Factors	Conditions or events that compel people to leave their homes or countries, such as economic hardship or political instability.
Pull Factors	Conditions or attractions that draw people to a new location, such as job opportunities or a desirable climate.

Watch Out for These Misconceptions

Common Misconception

Migration only refers to crossing international borders.

What to Teach Instead

Migration includes any significant relocation, including within a single country. The Great Migration and Sun Belt shift are two of the most consequential demographic events in US history, yet both are entirely domestic. Gallery walks using primary sources from these migrations make the domestic definition concrete.

Common Misconception

People moved to the Sun Belt primarily for retirement.

What to Teach Instead

While retirees are a visible group, the Sun Belt's growth was driven mainly by working-age families following jobs in defense manufacturing, technology, and construction, plus lower housing costs. Analyzing age-distribution data alongside population growth charts helps students see the full demographic picture.

Common Misconception

The Great Migration was a single, uniform event.

What to Teach Instead

The Great Migration occurred in two distinct waves with different destinations and drivers. The First Wave (1910-1940) was pushed by Jim Crow laws and pulled by industrial jobs. The Second Wave (1940-1970) was larger and more geographically diverse. Primary source timelines help students distinguish these phases.

Active Learning Ideas

Gallery Walk: Mapping the Great Migration

Post six stations around the room, each with a primary source: a photograph, a newspaper headline, a census data chart, a blues song lyric, a letter from a migrant, and a 1950 city demographic map. Students rotate in pairs, recording pull and push factors they observe. The class then assembles a composite list on the board.

35 min·Pairs

Think-Pair-Share: The Air Conditioning Argument

Students individually write a two-minute response to the question: 'If air conditioning had not been invented, how would the US population map look different today?' Pairs compare answers and identify one shared and one different prediction. Selected pairs share with the class before the teacher provides census data to check their reasoning.

20 min·Pairs

Case Study Analysis: Rust Belt to Sun Belt

Small groups receive a data packet with population change figures for three Rust Belt cities and three Sun Belt metros from 2000 to 2020. Groups identify the top two causes of each city's trajectory and propose one policy a Rust Belt city could adopt to reverse decline. Groups present their recommendations, and the class votes on the most feasible.

40 min·Small Groups

Individual Reflection: My Family's Migration Story

Students write a short paragraph tracing at least one migration in their family history, even if it is moving across a county. They then annotate a US map showing their family's moves and place it on a class map to visualize collective patterns. This works best as a take-home assignment followed by a brief class share.

15 min·Individual

Real-World Connections

• Urban planners in rapidly growing cities like Austin, Texas, analyze migration data to anticipate infrastructure needs, including housing, transportation, and public services.
• Real estate developers and investors study migration trends to identify emerging markets and areas with potential for growth, influencing housing construction in states like Florida and Arizona.
• Logistics companies, such as UPS and FedEx, adjust their delivery networks and staffing based on shifts in population distribution and the growth of e-commerce in different regions.

Assessment Ideas

Exit Ticket

Provide students with a map of the US. Ask them to label one city that was a major destination during the Great Migration and one state that has seen significant growth due to Sun Belt migration. Then, have them write one sentence explaining a key reason for each choice.

Discussion Prompt

Pose the question: 'If you were considering moving today, what would be your top three push factors and top three pull factors?' Allow students to share their personal considerations and then guide the discussion to connect these individual choices to larger national migration patterns.

Quick Check

Present students with a short list of historical and contemporary migration scenarios (e.g., 'Leaving sharecropping for factory jobs', 'Moving for remote work opportunities'). Ask them to classify each as primarily driven by 'push factors' or 'pull factors' and briefly justify their answer.

Frequently Asked Questions

What caused the Great Migration in the United States?

A combination of factors pushed Black Americans out of the South: Jim Crow segregation laws, racial violence, and limited economic opportunity. Northern and western industrial cities pulled migrants with higher-paying factory jobs, especially during the labor shortages of World War I and II. Both waves of the Great Migration transformed northern cities' demographics and cultural landscapes.

How did air conditioning change where Americans live?

Before widespread air conditioning in the 1950s and 1960s, the intense summer heat of the South and Southwest made dense settlement difficult. Mechanical cooling made year-round living comfortable in states like Florida, Arizona, and Texas, enabling rapid population growth. Combined with highway expansion and post-war prosperity, air conditioning is a direct geographic driver of Sun Belt population gains.

Why are people leaving the Rust Belt?

The Rust Belt's decline is rooted in deindustrialization. Steel and auto manufacturing contracted due to automation and global competition, eliminating the industrial jobs that built cities like Detroit and Pittsburgh. Shrinking tax bases led to reduced public services, further encouraging outmigration. Remote work has recently accelerated departures among younger, mobile workers seeking lower housing costs.

How does active learning help students understand internal migration?

Internal migration is abstract until it connects to personal and community stories. Mapping activities, primary source gallery walks, and family history reflections give students concrete entry points. When students see their own family's moves on a class map alongside census data, structural forces like economic decline and climate geography stop being textbook concepts and become real explanations.