Since "AM" doesn't take an object (INtransitive Verb) "WHO" is correct. Written declaratively, the sentence is I AM WHO, though unless you're the progenitor of the the band WHO you'd never use the construction. And, Eddie, WHOM is still used, and used often, not only in the states but throughout the Enlgish-speaking word, as the objective form of the subjective WHO.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
Eddie88I saw it written 'whom am I,' (no preposition preceding).Whoever wrote that was trying to sound "smart" and ended up instead showing ignorant.
Eddie88Introduce whoever you think is the tallest to whoever you think is the shortest.
Introduce whomever you invited first to whomever you invited last. I invited him first, but I invited him last.
Introduce whoever arrived first to whoever arrive