Since the corpus under consideration here identifies all uses by date and speaker, it is possible to contrast critical legislative and legal events with the occurrence of relevant terms or changing use of terms in the presidential lexicon and ask the question: How soon after this legislation was discriminatory language use dropped from presidential parlance?
i hypothesize that there should be a marked decrease in the use of 'mankind' to refer to all humankind, as well as the use of 'man' to refer to all people.