British Political Speech Archive
Transcripts from British speeches (1895 - 2015), categorized by date, speaker, party, and title
language change
University of Virginia Miller Center Presidential Speech Archive
Data from U.S. presidential speeches (1789 - 2010), including transcript, audio, and/or video (available modalities vary by speech)
American Rhetoric Speechbank
Data from public speeches, including transcript, audio, and/or video (varies by speech)
corpus.byu.edu
Links to language corpora (primarily English) from a variety of sources, including historical and contemporary uses from speeches, printed texts, and the internet