Which US president conducted the first transatlantic telegram exchange?

James Buchanan conducted the first transatlantic telegram exchange, making a significant milestone in communication history. In 1858, during his presidency, a successful message was sent across the Atlantic Ocean via a newly laid telegraph cable from the United States to Europe. This event marked the beginning of instant communication between North America and Europe, drastically reducing the time it took to send messages compared to previous methods such as ships or couriers. The successful transmission of the telegram demonstrated the technological advancements of the time and set the stage for further developments in global communication networks.