The answer is when teachers began to start educating and training their students at school! I hope this helped :D
Silk road of course or it can be silk
The United Kingdom of Great Britain and Ireland<span> and its </span>empire<span> remained officially neutral throughout the </span>American Civil War<span> (1861–65). It legally recognised the belligerent status of </span>the Confederacy<span>, but never recognized it as a nation and never signed a treaty or exchanged ambassadors. However, the top British officials debated intervention in the first 18 months. Elite opinion tended to favour the Confederacy, while public opinion tended to favour the United States. </span>
