If the Mexican American War had been much bloodier, might we see America carve out new nations from Mexico? I originally had planned on a larger Mexican cession, however I feel this is overdone and would like to posit the idea of an alternate partition.
My current thoughts are that America annexes Texas land claims, Las California and Nuevo Mexico. While they establish client states in Yucatan, Rio Grande [OTL Coahuila, Nuevo Leon and Tamaulipas] and Sonora [OTL Chihuahua, Durango, Sinaloa and Sonora, maybe Zacatecas]. Is there any way to make this work? Just how bad would the war need to achieve this effect?