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Mexico was trying to take Texas back but Texas was fighting to become independent.Texas gave lots of insulting offers to mexico such as where the border should be and to pay them a total of 30 million for both New mexico and California. -
On may 6 of 1846 the Mexican army crossed the Rio grande to stop the U.S. army.It took them 3 days crossing a river near Matamoros, and General Arista's plan was to wipe out General Taylers army as it carried it supplies to fort Texas. -
General Taylor and his army on May 8 and 9 of 1846 killed around 1,200 Mexican troops and the surviving troops retreated to the southside of the Rio grande.The U.S. had 3 goals which where to occupy northern Mexico,Take over California and New Mexico, and March on Mexico city and force mexico to surrender. -
General Santa Anna took command of the Mexican army,He then led 15,000 men into the battle of Buena vista where he would be defeated by the large cannons the U.S. had. -
The U.S. marched into Mexico city and attacked the chapultepec castle which was when the war ended.The treaty of Guadalupe Hidalgo, it meant mexico would lose half of their territory.The border was set to be on the rio grande and New Mexico,California,Arizona,Nevada,Utah, and parts of colorado and wyoming was giving to the U.S.