The correct answer would be the Mexicans. This is because no one really liked them and they had been starting trouble for a very long time.
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Who’s demands? You should put your question in more detail if you want an answer....
Sorry im late for this one. If you still need this question, the answer you're looking for is The Radical Republicans in the Senate opposed Lincoln’s Ten Percent Plan and demanded that Confederate states be punished for their rebellion against the Union.