So you can communicate via letters if there is a path and via visual communication if you can see the recipient, but what do you do when you go really long distances. Like between England and the USA, or from Darwin to Adelaide? Luckily technology advanced and electricity was discovered. Although electrons move through copper at only 80 centimeters per hour, an electromagnetic signal through it travels at 0.95 the speed of light which is 280 000 kilometers per second. This you can have nearly instant communication anywhere on this planet!
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