The following is a list of POSSIBLE topics, but you are by no means limited to what you see here. The keywords are meant to help you start searching for articles about your topics, but it is possible that there are more you could come across during your search.
Letter writing
keywords: snail mail, letters, writing letters
Pony Express and other methods of cross-country mail delivery before our current system
keywords: Pony Express, mail, sending letters
fax
keywords: fax machine, "Electric Printing Telegraph", telecopying, telefax
photocopying
keywords: photocopier, copier, copy machine, Xerox Machine
telegraph
keywords: optical telegraph, electric telegraph, Morse code, heliograph
teleprinter
keywords: TTY, teletype, teletypewriter
telephone
keywords: phone, switchboard, landline, rotary phones, "the horn"
newspapers
keywords: periodicals, newsstands, Benjamin Harris, press
bicycles
keywords: bike, cycle, cyclist, bicyclist, bicycle racing, carrier service
trains
keywords: rail transport, railroad, railway track, passenger train, AMTRAK
automobiles
keywords: cars, motor vehicle, steam-powered vehicles, locomotives
airplanes
keywords: aeroplane, aviation, aircraft, Amelia Earhart, jet airliner
U.S. highway system
keywords: United States numbered highway system, federal highways, auto trail organizations
trolley cars
keywords: trams, streetcars, electric tramway, coal trams
T.V.
keywords: television, Charles Francis Jenkins, cameras, color television, black and white
Radio
keywords: radio waves, Heinrich Hertz, radio broadcasting
Film
keywords: movie, motion picture, moving picture
Photography
keywords: images, photographic film, prints
Phonograph (and other non-digital forms of music hearing: CDs, cassette tapes, walkmans, etc)
keywords: CDs, cassette tapes, walkmans, gramophone, record player