A false premise is an incorrect theory that forms the basis of an argument or minor premise.
Answer:
Puritan
Explanation:
"John Brown was a leading figure in the abolitionist movement in the pre-Civil War United States. Unlike many anti-slavery activists, he was not a pacifist and believed in aggressive action against slaveholders and any government officials who enabled them. An entrepreneur who ran tannery and cattle trading businesses prior to the economic crisis of 1839, Brown became involved in the abolitionist movement following the brutal murder of Presbyterian minister and anti-slavery activist Elijah P. Lovejoy in 1837. He said at the time, “Here, before God, in the presence of these witnesses, from this time, I consecrate my life to the destruction of slavery!”"
IF I can sing well enough, I'll join the school chorus.
The IF implies that something is conditional i.e. it may happen, it may not happen (it depends on whether you can sing well enough!)
Hope this helps... :)