How would the development of the Far West and Mexican North develop if the United States had possession of the Colorado River watershed all the way down to the river's delta with the Sea of Cortez? If you want to, you could expand the idea to include the Colorado Desert, the Rio Concepcion, Baja California, the Sonoran Desert, or any other area you are inclined to include.
I think Arizona might end up with the southern tip of OTL Nevada (Las Vegas) and a sea coast too.
I think Arizona might end up with the southern tip of OTL Nevada (Las Vegas) and a sea coast too.