Texas TEKS 8.6.C

Social Studies8th GradeHistory

The Standard

explain the causes and effects of the U.S.-Mexican War and their impact on the United States.

Texas Essential Knowledge and Skills for Social Studies

Teacher's field guide

What Students Need to Do: Students explain why war began, including Texas annexation, the border dispute, and expansionist goals. They connect the war’s outcome to territorial growth and rising conflict over slavery.
What Mastery Looks Like: Students build an accurate cause-and-effect chain using specific events and the Treaty of Guadalupe Hidalgo. They explain how the Mexican Cession increased sectional tension in the United States.
Common Misconceptions: Students often confuse the Texas Revolution with the later war between the United States and Mexico. They may also treat territorial gain as the only effect, missing the renewed debate over slavery.
How to Assess It: Give students four terms: Texas annexation, Rio Grande dispute, Mexican Cession, and slavery debate. Ask them to write a four-sentence cause-and-effect explanation using all four.

Lesson moves

Have pairs arrange event cards into causes, wartime events, and effects, then connect the cards with labeled arrows.
Ask students to write whether territorial expansion strengthened or divided the United States, using two specific facts.
Run a cause-and-effect matching game with cards for Texas annexation, border claims, treaty terms, territorial gains, and sectional conflict.
Use a current U.S. map to shade land gained from Mexico, then identify the states located there today.

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