If the Confederacy were to buy land in mexico (from Juarez or Maximillion, or even both to ensure its thiers?) during the Civil War, would the United States invade it?
I think they wouldn't, as they would recognize the legitimacy of the Confederacy as its own nation, and not as a rebellion. Am I mistaken?
Assuming my initial assumption is correct could a rump CSA live on in Northern Mexico? How much land would the Confederates be able to buy in the first place? Could they buy sonora with its vast silver mines, or would the mines need to remain under mexican control?