Conversation so far:
who developed and patented the electrical telegraph in the united states in 1837
Inventor Samuel Morse developed the telegraph system, and submitted a patent for his device, which he called “The American Recording Electro-Magnetic Telegraph” in 1837.
how did samuel morse's telegraph work
Samuel Morse's telegraph worked by transmitting electrical signals over a wire laid between stations.

Question: what was the first message sent
Self-contained rewrite: what was the first telegraphic message sent