Sorry, Trick was correct in the first place. Wherefore means why, not where.
Synonyms: account, antecedent, argument, base, bedrock, call, cause, demonstration, determinant, dope, evidence, excuse, factor, footing, foundation, goods, groundwork, inducement, info, infrastructure, justification, motive, numbers, occasion, premise, pretext, proof, rationale, reason, root, seat, straight stuff, substratum, test, testimony, trial, underpinning, wherefore, why, whyfor
Sorry, that one drives me a little bit crazy in the head.
But I'll give you a little karma grope to ease the pain.