Mexican American War

United States President James K. Polk decides to wage war with Mexico when General Zachary Taylor and U.S. troops are attacked on April 25, 1846. Polk received official Congressional approval for a Declaration of War on May 13, 1846. 

U.S. forces were victorious in the war and delivered a damaging defeat by diminishing Mexico's national territory by half. The Mexican-American War came to an end with the signing of the Treaty of Guadalupe Hidalgo by both countries on February 2, 1848.

1821 Mexico gains it's independence from Spain
1833 Santa Anna is elected President of Mexico
1835 Texas Revolution
1845 March 1, American President John Tyler signs Congressional resolution to annex Texas
1845 James K. Polk is elected the 11th United States President
Polk sends John Slidell to Mexico City in an attempt to buy New Mexico and California from the Mexican Government unsuccessfully
General Zachary Taylor marches his army to the southern border of Texas towards the Rio Grande, a border Mexico disputes
Taylor's army is attacked by General Mariano Arista's Calvary upon crossing the Rio Grande, surrounding a U.S. scouting party and killing several. Taylor sends a letter back to President Polk informing him of the hostile attack by Mexico
1846 May 8, The Battle of Palo Alto a victory for General Taylor
May 9, Battle of Resaca de la Palma another resounding victory for General Taylor that forces the Mexican calvary across the Rio Grande Texas border
1846 May 13, With the approval of the U.S. Congress President James Polk declares war with Mexico
The Bear Flag Revolt in Monterey, California
Santa Anna returns from exile
September 20, The Battle of Monterrey lead by General Taylor. The city is occupied successfully upon defeating the Mexican forces lead by General Pedro de Ampudia
1847 February 20, The Battle of Buena Vista
March 9, The Battle of Veracruz
April 18, The Battle of Cerro Gordo
August 20, The Battles of Contreras and Churubusco
September 8, The Battle of Molino del Rey
September 13, The Battle of Chapultepec
September 14, General Winfield Scott takes Mexico City
Santa Anna resigns as President of Mexico
General Pedro Maria Anaya is elected President of Mexico
1848 February 2, The Treaty of Guadalupe Hidalgo is signed
March 10, The Treaty of Guadalupe Hidalgo is ratified by the United States Congress
The Treaty of Guadalupe Hidalgo is ratified by Mexico's Congress
The Treaty of Guadalupe Hidalgo ended the U.S. war with Mexico and all remaining U.S. troops leave Mexico on July 15

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