The Neuches strip, Alta California and Nuevo Mexico.
The US gained California and the American Southwest.
The Mexican American War.
It gained California and the American Southwest.
They gained the annexation of Texas.
They gained California I think
The Whigs.
The Wilmot Proviso
The U.S. gained more land as a result of the Mexican-American War. All of the land that is between California to Texas was cedes by the Mexicans.
The Mexican Cession.
The Wilmot Proviso, which was a proposed amendment to legislation arising from the Mexican-American War, aimed to ban slavery in any territory acquired from Mexico. Had the Wilmot Proviso been enacted, it would have made slavery illegal in the territories gained during the Mexican-American War.
Texas fought for Independence from Mexico and gained it in the Treaties of Velasco. The US then annexed Texas which resulted in the Mexican American War.
Texas and Oregon were gained after the American Mexican war when Mexico ceded those territories ,and more, to the U.S.