Answer:
CAUSES
A border dispute over whether Texas ended at the Nueces River (Mexican claim) of the Rio Grande (U.S. claim)
An attack on American troops by Mexican soldiers in the disputed area between the two rivers on April 25, 1846.
The Unites States annexation of Texas in 1845
Outcomes :
General Zachary Taylor, a hero of the war, used his newfound notoriety to become the twelfth president of the U.S.
Mexico ceded to the United States nearly all of the territory now included in the states of New Mexico, Utah, Nevada, Arizona, California, Texas, and western Colorado in exchange for $15 million
The reopening of the slavery-extension issue, which had been largely dominant since the Missouri Compromise of 1820, and a corresponding rise in sectional antagonism in the U.S.
What did the U.S. gain by winning the Mexican-American War?
Under the Treaty of Guadalupe Hidalgo, which settled the Mexican-American War, the United States gained more than 500,000 square miles (1,300,000 square km) of land, expanding U.S. territory by about one-third. Mexico ceded nearly all the territory now included in the U.S. states of New Mexico, Utah, Nevada, Arizona, California, Texas, and western Colorado for $15 million and U.S. assumption of its citizens’ claims against Mexico.
