Which issue lead to Texas seceding from the union? the reservation system
slavery
war with Mexico
corruption

Slavery.

Explanation:

After Abraham Lincoln was elected president of Texas, fear was created that the new Republican president might abolish slavery in Texas. Lincoln's policy alluded to such a sequence of events. That is why the leaders of Texas decided to carry out secession in that state. The Texas leadership was determined in its intentions to secede from the Union of American States.

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