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Spanish-American War instead of the Mexican-American War
Would the United States have gone to war for Spanish Possessions in the Gulf and Caribbean sooner if they were unwilling/able to take Texas and the American southwest from Mexico in the 1840's?
Criteria:
The war needs to start between 1848-1858 and end before 1860
Independent Texas exists
The southern border of the continental US must remain at the Adams-Onis Treaty line.
California gold rush happens OTL
Questions:
Will the US win or lose?
Could this postpone, prevent or start the ACW?
What international repercussions should the US expect?
Is there resistance from the natives/reaction to slavery?