Why did seceding states believe they had to leave the union

Because the newly-elected Lincoln refused to allow the creation of any new slave-states.

The President Elected, Abraham Lincoln, was a known anti-slavery activist and he didn't allow the creation of new slave-states. As consequences, since there were more states joining the Union, the most likely scenario was a congress dominated with states that would adopt politics that could be unfavorable for the Southern States.

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explanation:

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yes they have. but is this a true false question? if it is, the answer is true.