II. August 16, 1858
The first transatlantic telegraph cable was launched today. To commemorate the great innovation, the U.S President and Britain’s Queen exchanged communication over the line.

To read more: https://en.wikipedia.org/wiki/Transatlantic_telegraph_cable#:~:text=The%20first%20communications%20occurred%20on,and%20was%20completed%20in%201858.