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

One paper per student

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

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: Some Americans hoped new land would let slavery spread, The United States paid Mexico $15 million, The Rio Grande became the border of Texas, The two countries disagreed over whether Texas ended at the Nueces River or the Rio Grande

CauseEffect

2.Sort each one: Cause or Effect?

Sort: Mexico refused to sell California and New Mexico to the United States, President Polk sent US soldiers into the land between the two rivers, California, Nevada and Utah became US land, Americans argued bitterly over whether slavery would be allowed in the new land

CauseEffect

3.Sort each one: Cause or Effect?

Sort: The United States annexed Texas in 1845, Tens of thousands of Mexican citizens now lived inside the United States, Many Americans believed the country should stretch to the Pacific Ocean, Mexico gave up about half of its land

CauseEffect

LessonPrint · D2.His.14.3-5 · Set 22 · free to copy for classroom use

Answer key — The Mexican-American War

Set 22. Prints on its own sheet.

1.1. Some Americans hoped new land would let slavery spread — Cause 2. The Rio Grande became the border of Texas — Effect 3. The two countries disagreed over whether Texas ended at the Nueces River or the Rio Grande — Cause 4. The United States paid Mexico $15 million — Effect
2.1. Americans argued bitterly over whether slavery would be allowed in the new land — Effect 2. California, Nevada and Utah became US land — Effect 3. Mexico refused to sell California and New Mexico to the United States — Cause 4. President Polk sent US soldiers into the land between the two rivers — Cause
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. Tens of thousands of Mexican citizens now lived inside the United States — Effect 4. The United States annexed Texas in 1845 — Cause

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