Mexicans
we won the mexican war
it was right and Mexican won the war
You need to specify what is the 'them' you are referring to. I assume you meant slaves: as the Union side won, slaves were freed from bondage.
The United States
The people.
Mexico won the war that's y Mexican celebrate cinco de mayo (fith of may)
The US won the Mexican American War against Mexico.
The United States.
the Americas won :)
America won the war and got the land they wanted.
Mexico after 11 years.
When America won the Mexican-American war.