Oklahoma Social Studies 8.C.9.2.B
The Standard
- 8.C.9
- Examine the political, economic, social, and geographic changes that occurred during the period of westward movement.
- 8.C.9.2
- Analyze the territorial growth of the United States of America and the consequences of westward expansion.
Describe the impact of the Treaty of Guadalupe Hidalgo on Mexican Americans (e.g., United States of America citizenship, displacement and land loss).
Oklahoma Academic Standards for Social Studies (2026) · 8.C.9.2
Teacher's field guide
What This Standard Means
What Students Need to Do
- Explain how the 1848 border change affected Mexican families living in the ceded territory. Describe their citizenship choice and how some families later lost land or had to move.
What Mastery Looks Like
- A student can use a map to show how a family became U.S. residents without moving. They can explain how a disputed land claim could lead to land loss despite treaty protections.
Common Misconceptions
- Students may think Mexican residents had to leave when the border changed. They may also assume treaty protections meant every family kept its land, or that every family lost it.
How to Assess It
- Ask students: “What citizenship choice did a Mexican family in Santa Fe have after 1848, and how might that family later lose its land?”
Lesson moves
Ways to Teach It
Give pairs maps from before and after 1848; have them shade the ceded territory and mark one family that stayed put.
Read a short treaty summary, then ask students to write why a family might lose land despite its promised rights.
Have teams sort six cards into treaty promises and later outcomes, including citizenship, disputed land claims, and displacement.
Find Santa Fe on a current map, then explain how a resident’s descendants could live in the United States without crossing a border.
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Related Standards
- 8.C.9.2.A
Summarize the series of events and the processes used to annex Texas, as well as acquire the Mexican Cession and the Gadsden Purchase.
- USH.C.1.4
Analyze the impact of immigration on settlement patterns in American society and economic growth.
- USH.C.1.3.A
Explain the impact of the Homestead Act, the completion of the Transcontinental Railroad, and the purchase of Alaska on settlement patterns and Native populatio...
- 8.C.9.2.E
Describe the impact of westward migration on American Indian culture, homelands, Tribal sovereignty, and the growing sectional tensions regarding the expansion ...
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