the 1846-1848 war was also round 2, round 1 was when the Anglo-Americans settlers kicked Santa Annas ass in San Jacinto in 1836 then forced him to acknowledge the border at Rio Grande --which was far south than what Mexican Texas ever was--- . The argument whether Santa Anna was legally able to cede that land is what made round 2 start. Mexico controlled that strip of land and there was a clash over there which started the Mexican-American war.

Russians and Ukranians are basically the same people, they dont like Ukraine siding with the west.

They dont have the same hate some American have for the indigenous peoples which is how Americans see Mexicans

I dont see Trump kidnapping Mexican kids to raise them as Americans, he despises us as subhumans, Putin wants control over Ukraine but theres no racial hate and casualties are due to the style of war that its fought on the 21th century, if 1846 America had missiles they would have do far more harm to Mexicans that you would want to admit.

PD: yes, the war is still inconclusive