Question

You have been reading about the war between the United States and Mexico from 1846 to 1848. It sprang out of a dispute between two countries over the southern border of Texas. The U.S. claimed the Rio Grande as the border, while Mexico claimed the Nueves River farther north. Each based its claim, in part, on agreements made at the end of the Texas war for independence, which ended in 1836. Each also based its claim on nationalism, or national self-interest, and a desire to expand its territory. For this portfolio project, you will explore different perspectives regarding the Mexican-American War. You will then present your findings in a short essay.

heres the first question: List basic facts about the root of the conflict—include who, what, when, where, and why.

Answer 1

Basic facts about the root of the conflict (who, what, when, where, why)

- Who
- United States (President James K. Polk, U.S. Army and Congress)
- Mexico (Mexican government and army; General Antonio López de Santa Anna played a major role later)
- The Republic of Texas (independent after 1836; its border claims were central to the dispute)
- American settlers in Texas and U.S. expansionists (Manifest Destiny supporters)

- What
- A diplomatic and military dispute over the southern boundary of Texas that escalated into the Mexican–American War (1846–1848).
- Core issue: which river marked Texas’s southern border — the Rio Grande (U.S./Texas claim) or the Nueces River (Mexico’s claim).

- When
- Texas won independence from Mexico in 1836.
- The U.S. annexed Texas in 1845.
- Armed conflict: 1846–1848.
- Ended by the Treaty of Guadalupe Hidalgo in 1848.

- Where
- The disputed strip of land between the Nueces River and the Rio Grande (present-day southern Texas).
- Fighting extended into northern Mexico and across the Southwest (including California and New Mexico).

- Why (root causes)
- Border ambiguity after the Texas Revolution: the Treaties signed at the end of the Texas war (e.g., the Velasco agreements) were disputed and not accepted by Mexico.
- U.S. expansionism and Manifest Destiny—desire to acquire more territory.
- National pride and security: both nations asserted sovereignty and honor.
- Domestic U.S. politics, including the expansion of slavery (many Southern politicians supported annexation).
- Immediate diplomatic breakdown after U.S. attempts to purchase Mexican territories failed and U.S. troops were deployed to the disputed zone.

- Immediate spark
- President Polk sent U.S. forces under General Zachary Taylor to the Rio Grande after annexation; a clash between Mexican forces and U.S. troops in May 1846 (the Thornton Affair) gave Polk grounds to ask Congress to declare war.

- Outcome (brief)
- Treaty of Guadalupe Hidalgo (1848): Mexico recognized the Rio Grande as Texas’s border and ceded much of the modern American Southwest to the U.S. (the Mexican Cession).