The treaty gave the U.S. undisputed control of Texas, established the U.S.-Mexican border of the Rio Grande, and ceded to the United States the present-day states of California, Nevada, Utah, New Mexico, most of Arizona and Colorado, and parts of Texas, Oklahoma, Kansas, and Wyoming.
https://en.wikipedia.org/wiki/Mexican%E2%80%93American_War
His message to Congress on May 11, 1846, stated that Mexico has passed the boundary of the United States, has invaded our territory and shed American blood upon American soil.. Congress approved the declaration of war on May 13, with southern Democrats in strong support.
https://en.wikipedia.org/wiki/Mexican%E2%80%93American_War
In February of 1848 the two sides agreed on the Treaty of Guadalupe Hidalgo. Mexico was forced to sign over all of California, Utah and Nevada as well as parts of New Mexico, Arizona, Wyoming and Colorado in exchange for $15 million dollars and exoneration of about $3 million more in previous liability. The Rio Grande was established as the border of Texas.
http://latinamericanhistory.about.com/od/Mexican-AmericanWar/a/The-Mexican-American-War.htm
In 1845, the Republic of Texas was annexed to the United States of America, becoming the 28th U.S. state.
https://en.wikipedia.org/wiki/History_of_Texas_(1845%E2%80%9360)
If the war was a bonanza for the United States of America, it was a disaster for Mexico. If Texas is included, Mexico lost more than half of its national territory to the USA between 1836 and 1848. After the bloody war, Mexico was in ruins physically, economically, politically and socially.
http://latinamericanhistory.about.com/od/Mexican-AmericanWar/a/The-Mexican-American-War.htm
Texas had been admitted to the United States as a slave state, yet Texas claimed territory north of the 36°30' demarcation line for slavery set by the 1820 Missouri Compromise.
https://en.wikipedia.org/wiki/History_of_Texas_(1845%E2%80%9360)
The United States sent John Slidell to negotiate with the Mexican government, offering $25 million ($681,442,308 today) to set the Texas border at the Rio Grande and to purchase Mexico’s provinces of Alta California and Santa Fe de Nuevo Mexico. méxico
https://en.wikipedia.org/wiki/History_of_Texas_(1845%E2%80%9360)
The 1848 Treaty of Guadalupe Hidalgo ended and specified the major consequence of the war: the forced Mexican Cession of the territories of Alta California and Santa Fe de Nuevo Mexico méxico to The United states in exchange for$ 15. million
https://en.wikipedia.org/wiki/Mexican%E2%80%93American_War
The Republic of Texas had formed in 1836, after breaking away from Mexico in the Texas Revolution. The following year, an ambassador from Texas approached the United States about the possibility of becoming an American state.
https://en.wikipedia.org/wiki/History_of_Texas_(1845%E2%80%9360)
Border disputes between the new state and Mexico, which had never recognized Texas independence and still considered the area a renegade Mexican state, led to the Mexican–American War (1846–1848).
https://en.wikipedia.org/wiki/History_of_Texas_(1845%E2%80%9360)
when did the us take the texas territory
The United States takes the Texas territory in between 1836 and 1848. The United States took the Texas territory in between 1836 and 1848.