What the Opium Wars can tell us about China, the US and fentanyl

Fentanyl is the latest battleground in a trade war between the world’s 2 largest economies. China is the main source (moving to Mexico) of the precursor chemicals needed to manufacture fentanyl. There are lessons to be learned from the First Opium War of 1839-42, Professor Martin Danahay of Brock University advises.