U.S. Strategy to Defeat Mexico in the Mexican-American War (1846–1848)

How the U.S. Won the Mexican-American War

The United States employed a **multi-pronged strategy** combining military, economic, and diplomatic pressure to defeat Mexico (1846–1848).

1. Blockade & Port Seizure

• U.S. Navy blockaded **Gulf ports** (Veracruz, Tampico) and **Pacific ports** (Mazatlán, Guaymas, San Blas).
• Cut off imports (weapons, munitions) and export revenue (silver, customs).

2. Northern Invasion & Territory Seizure

• **Gen. Zachary Taylor** crossed Rio Grande, won **Palo Alto, Resaca de la Palma, Monterrey, Buena Vista**.
• **Gen. Stephen Kearny** took **Santa Fe (NM)** and **California** (with Stockton, Frémont, Bear Flag Revolt).
• **Gen. John Wool** marched on Chihuahua.

3. Central Campaign: Veracruz to Mexico City

• **Gen. Winfield Scott** amphibious landing at **Veracruz (Mar 1847)** — first major U.S. amphibious assault.
• Marched inland: **Cerro Gordo, Puebla, Contreras, Churubusco, Molino del Rey, Chapultepec**.
• Entered **Mexico City (Sept 1847)** — forced surrender.

4. Superior Technology & Training

• **Artillery:** U.S. "flying artillery" (light, mobile) outranged Mexican guns.
• **Small arms:** Rifled muskets vs. smoothbores.
• **Officers:** West Point graduates (Lee, Grant, Jackson, McClellan) — professional core.
• **Logistics:** Wagon trains, steamboats, rail (Veracruz line built during war).

5. Exploit Internal Divisions

• Supported **federalists vs. centralists**; encouraged **Yucatán independence**.
• Recruited **San Patricios** (Irish deserters) — but mostly Mexicans fought for Mexico.
• Promised **protection for Catholic Church** to undercut clergy opposition.

6. Diplomatic Isolation

• Prevented European (British, French) intervention via Monroe Doctrine + negotiations.
• Secured **Treaty of Guadalupe Hidalgo (1848)** — Mexico ceded 55% territory (CA, NV, UT, AZ, NM, CO, WY).

The U.S. combined **naval strangulation, multi-axis land invasion, professional officer corps, and diplomatic containment** to overwhelm a larger but divided, under-equipped Mexican republic.