In 1945 use of telegraphy peaked in the United States with the transmission of "236,169,000,000" messages during that year, presumably because this was the year in which so many soldiers returned home from World War II.

Jeremy Norman Collection of Images - Creative Commons
Cover of a book of Western Union telegram forms, circa 1945.

Jeremy Norman Collection of Images - Creative Commons
Collection of Western Union telegraph paper advertising stickers that could be pasted to telegrams when they were delivered or mailed.