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The Mexican-American War and the massive territory gained reopened debates over slavery which diminished party alliances and increased sectional alliances. These debates over slavery eventually led to the demise of the Second Party System and paved the way for the rise of Republicanism.


The catalyst for the Mexican-American War was the U.S. annexation of Texas on 29 December 1845. When Mexico responded by ending diplomatic relations with the U.S. government, President James K. Polk asked Congress to declare war on Mexico. Polk took advantage of the animosity between the two nations to advance a political agenda focused on Manifest Destiny (the belief that the U.S. was ...


The Mexican-American War was formally concluded by the Treaty of Guadalupe-Hidalgo. The United States received the disputed Texan territory, as well as New Mexico territory and California. The Mexican government was paid $15 million — the same sum issued to France for the Louisiana Territory. The United States Army won a grand victory.


The Mexican-American war was a training ground for many Civil War leaders. Robert E. Lee, Stonewall Jackson, and Ulysses S. Grant were some of many who experienced combat during the war. Innovative tactics and strategies learned in Mexico unfolded in the Civil War. Effective leaders allowed the South to fight back when it should have crumbled.


The Mexican-American war in a nutshell May 13, 2020 by NCC Staff May marks two key anniversaries in the conflict between the United States and Mexico that set in motion the Civil War—and led to California, Texas, and eight other states joining the Union.


It resulted in a major territorial gain for the US (the Mexican Cession in 1848) that completed its expansion from the Atlantic to the Pacific coast. It meant an increase of US territory ...


On May 13, 1846, 165 years ago today, the U.S. Congress declared war against Mexico, thus marking the beginning of the Mexican-American War, a conflict that saw the U.S. take possession of more than 500,000 square miles of Mexican territory.The war was precipitated by the U.S. annexation of Texas in 1845 and a dispute over the boundary between Texas and Mexico.


We should also keep in mind that Mexico (actually Santa Anna) DID sell the US the land that became known as the Gadsden territory in 1854 - only 6 years after the end of the Mexican American War. Mexico was broke (again) and Santa Anna needed money to pay his army to put down ongoing rebellions and maintain his extravagant lifestyle.


The Mexican-American War marked a turning point in the debate over slavery in the United States because it reopened the slavery debate in Congress due to the disputed motives of the war, the failure of the Wilmot Proviso, and the size of the territory included in the treaty of Guadalupe Hidalgo.


Consequences of the Mexican War. Posted on January 25, 2011.Filed under: American history | Tags: California, Civil War, Compromise of 1850, Free Soil, Mexican War, Missouri Compromise, slavery, westward migration | Part the last of our series on interesting facets of the Mexican War concludes with the 1848 peace Treaty of Guadalupe Hidalgo, which gave the United States full ownership of Texas ...