The Telegraph
Samuel Morse's electric telegraph sent messages down a wire at the speed of electricity, severing information from physical transport for the first time in history — news that once travelled at the pace of a galloping horse now crossed a continent in minutes. Within decades, cables under the oceans wired the world into a single nervous system. It was the leap the printing press began and the internet would complete: each one reordering who knows what, and when.
A new way to record or transmit information lowers the cost of copying ideas and reorders who holds knowledge and power.