For an accessible book on the history and impact of the early telegraph networks I'd recommend The Victorian Internet by Tom Standage.
For anyone curious about it, you can click the Read Sample button below the cover image here, or download the sample to your Kindle device or app:
https://www.amazon.com/dp/B07JW5WQSR
If Vint Cerf's foreword and the first chapter don't convince you to buy the book, I don't know what will.
Another good read, as many know, is Mother Earth Mother Board. It is more about the modern undersea fiber cables, but touches on the early telegraph cables too:
https://www.wired.com/1996/12/ffglass/
On my PC, this article says it is for subscribers only. But on my phone (Android with Chrome) it loads up just fine. Go figure.
Either way, you can then scroll up or down in the preview. Let me know if you got that far, or where you did get to, and I will be happy to assist further.
(I'm not the Amazon Kindle Sample Support Guy, but I like this book so much that I don't mind helping sort this out.)
Transatlantic commerce has been foiled by copyright.
It's a lovely topic to dive into and adjust your search key words according to whatever aspect interests you the most (engineering, business, economics, public service (european countries) vs free market (USA), politics, war, travel/tourism, time/clocks, railroads, ..., telegraphy changed everything).