What territory did the mexican- american war open up to american settlers?

The Mexican-American War opened up the American Southwest and California to settlers. Prior to the mid-18th century war, Mexican territory encompassed what is now Arizona, New Mexico, and a bulk of California. However, following the Mexican surrender, the US laid claim to most of that land thereby opening the regions up to American settlers moving west.

The answer is william henry harrison pursued and defeated british forces retreating into canada.

Is this a joke question or what, obviously that means red dead redemption 2!