The Mexican-American War is a free printable Grade 3 to Grade 5 social studies worksheet on the causes and effects of the Mexican-American War, aligned to C3 Framework indicator D2.His.14.3-5. It prints 3 questions with an answer key on its own sheet of paper, in 25 versions that each ask different questions, so no two students in the class work from the same page. Print it from the browser or download it as a PDF — no account, no email.

Set 21 of 25 · the same problems every time you open this link.

One paper per student

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Set 1 has all 25 in a single PDF. All 25 sets ask different questions.

The Mexican-American War

D2.His.14.3-5

NameDate

Sort each one: was it a cause of the war or an effect of it?

1.Sort each one: Cause or Effect?

Sort: The two countries disagreed over whether Texas ended at the Nueces River or the Rio Grande, Tens of thousands of Mexican citizens now lived inside the United States, The Rio Grande became the border of Texas, Mexico refused to sell California and New Mexico to the United States

CauseEffect

2.Sort each one: Cause or Effect?

Sort: Mexican and US soldiers clashed near the Rio Grande in April 1846, California, Nevada and Utah became US land, Some Americans hoped new land would let slavery spread, The Treaty of Guadalupe Hidalgo was signed in 1848

CauseEffect

3.Sort each one: Cause or Effect?

Sort: Mexico gave up about half of its land, Many Americans believed the country should stretch to the Pacific Ocean, Thousands of soldiers on both sides died, The United States annexed Texas in 1845

CauseEffect

LessonPrint · D2.His.14.3-5 · Set 21 · free to copy for classroom use

Answer key — The Mexican-American War

Set 21. Prints on its own sheet.

1.1. Mexico refused to sell California and New Mexico to the United States — Cause 2. Tens of thousands of Mexican citizens now lived inside the United States — Effect 3. The Rio Grande became the border of Texas — Effect 4. The two countries disagreed over whether Texas ended at the Nueces River or the Rio Grande — Cause
2.1. California, Nevada and Utah became US land — Effect 2. Mexican and US soldiers clashed near the Rio Grande in April 1846 — Cause 3. Some Americans hoped new land would let slavery spread — Cause 4. The Treaty of Guadalupe Hidalgo was signed in 1848 — Effect
3.1. Many Americans believed the country should stretch to the Pacific Ocean — Cause 2. Mexico gave up about half of its land — Effect 3. The United States annexed Texas in 1845 — Cause 4. Thousands of soldiers on both sides died — Effect

Last reviewed 2026-09-05. Aligned to D2.His.14.3-5 of the C3 Framework for Social Studies State Standards.