First long-distance telegraph message from the U.S. Capitol

On May 24, 1844, Samuel F. B. Morse sent the telegraph message "What hath God wrought" from the Supreme Court chamber of the United States Capitol to Baltimore, demonstrating the first long-distance electrical telegraph transmission on the Washington–Baltimore line. The event marked a pivotal public demonstration of telegraphy’s practical use for long-distance communication in the United States. It is documented as the opening demonstration of the line connecting Washington and Baltimore.