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 8 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 Rio Grande became the border of Texas, Mexican and US soldiers clashed near the Rio Grande in April 1846, The two countries disagreed over whether Texas ended at the Nueces River or the Rio Grande, Mexico gave up about half of its land

CauseEffect

2.Sort each one: Cause or Effect?

Sort: The United States paid Mexico $15 million, Some Americans hoped new land would let slavery spread, Many Americans believed the country should stretch to the Pacific Ocean, California, Nevada and Utah became US land

CauseEffect

3.Sort each one: Cause or Effect?

Sort: Americans argued bitterly over whether slavery would be allowed in the new land, Mexico refused to sell California and New Mexico to the United States, Tens of thousands of Mexican citizens now lived inside the United States, President Polk sent US soldiers into the land between the two rivers

CauseEffect

LessonPrint · D2.His.14.3-5 · Set 8 · free to copy for classroom use

Answer key — The Mexican-American War

Set 8. Prints on its own sheet.

1.1. Mexican and US soldiers clashed near the Rio Grande in April 1846 — Cause 2. Mexico gave up about half of its land — 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. Many Americans believed the country should stretch to the Pacific Ocean — Cause 3. Some Americans hoped new land would let slavery spread — Cause 4. The United States paid Mexico $15 million — Effect
3.1. Americans argued bitterly over whether slavery would be allowed in the new land — Effect 2. Mexico refused to sell California and New Mexico to the United States — Cause 3. President Polk sent US soldiers into the land between the two rivers — Cause 4. Tens of thousands of Mexican citizens now lived inside the United States — Effect

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