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| 1835 CE | When professor of arts and design at New York University, Samuel Morse proved that signals could be transmitted by wire and hence develops the Morse code. He used pulses of current to deflect an electromagnet which moved a marker to produce written codes on a strip of paper. | |
| 1837 CE | Samuel F. B. Morse exhibits an electric telegraph in the US. | |
| 1838 CE | Samuel F. B. Morse made first public demonstration of the telegraph. | |
| 1843 CE | Samuel Morse starts building the first long distance electric telegraph line when the US Congress granted $30,000 to fund the construction of a 40 mile experimental telegraph line from Washington to Baltimore. | |
| 1 May 1844 CE | Samuel Morse's incomplete Washington to Baltimore telegraph, transmitted a message that was hand-carried from Baltimore to Annapolis Junction where Alfred Vail sent it to Washington. | |
| 24 May 1844 CE | Samuel F. B. Morse's Washington to Baltimore telegraph is completed. | |
| 24 May 1844 CE | The first telegraphed news dispatch is published in the Baltimore Patriot. | |
| 24 May 1844 CE | Using the completed Washington to Baltimore telegraph, Samuel F. B. Morse taps out 'What hath God wrought' from Supreme Court chamber in Washington to his partner Alfred Vail in Baltimore. | |
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