It's called - Utopian Society
The British Army sustained many casualties.
The U.S. had been a decisive force in the English and French winning the war and had revealed its vast industrial might. It was well positioned to come out of the shadows and take over the baton of premier world power from Great Britain. It showed the world that when in time America can buckle down and mass produce everything it needed, fast. Ammunition, Tanks, planes, Artillery, all of these were being produced by a unprecedented level and it showed the world that america can beat anyone.
After Mexico's defeat on the Mexican-American War (1846-1848), the Treaty of Guadalupe Hidalgo came into action. The U.S. was recquired to pay 15 million dollars as compensation for damages, while taking ownership of the territories of California, half of New Mexico, most of Arizona, Nevada, Utah and parts of Wyoming and Colorado.
Mexicans that were settled in these territories, had the choice to relocate within the new limits of their country, or stay and receive American citizenship with full civil rights. This had quite big implications in U.S. culture as it became more racially diverse. In the following censuses between 1850 and 1920 most annexed mexicans were counted as "white", but in reality, segregation only grew with time and continues to do so until this day, with mexican-native americans being considered foreigners almost universally. At the same time, mexican migration to these areas also continued to rise over the years, making the contrast bigger.
Politically, we can say Mexico wasn't in a bad position in terms of their negotiation power. The U.S. had shown itself hesitant to annex Mexico's territories and having deep domestic divisions in regards to the aims and justification for the expansion. However, the military power of the U.S. overshadowed all of that and their victory was definite. The treaty established a pattern of political inequality between the two countries, and this lopsided relationship has stalked Mexican-U.S. relations ever since.
Hope this helps!
