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 10 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: President Polk sent US soldiers into the land between the two rivers, 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, Americans argued bitterly over whether slavery would be allowed in the new land

CauseEffect

2.Sort each one: Cause or Effect?

Sort: Mexico refused to sell California and New Mexico to the United States, The United States paid Mexico $15 million, Mexico gave up about half of its land, Some Americans hoped new land would let slavery spread

CauseEffect

3.Sort each one: Cause or Effect?

Sort: Thousands of soldiers on both sides died, The United States annexed Texas in 1845, Mexican and US soldiers clashed near the Rio Grande in April 1846, The Rio Grande became the border of Texas

CauseEffect

LessonPrint · D2.His.14.3-5 · Set 10 · free to copy for classroom use

Answer key — The Mexican-American War

Set 10. Prints on its own sheet.

1.1. Americans argued bitterly over whether slavery would be allowed in the new land — Effect 2. President Polk sent US soldiers into the land between the two rivers — Cause 3. Tens of thousands of Mexican citizens now lived inside the United States — Effect 4. The two countries disagreed over whether Texas ended at the Nueces River or the Rio Grande — Cause
2.1. Mexico gave up about half of its land — Effect 2. Mexico refused to sell California and New Mexico to the United States — Cause 3. Some Americans hoped new land would let slavery spread — Cause 4. The United States paid Mexico $15 million — Effect
3.1. Mexican and US soldiers clashed near the Rio Grande in April 1846 — Cause 2. The Rio Grande became the border of Texas — 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.