As the world reels from US President Donald Trump's tariffs onslaught, here is a look back at some major trade wars since the ...

here is a look back at some major trade wars since the 19th century: – 19th century Opium Wars – In the mid-19th century, two conflicts over the opium trade, which became known as the Opium ...

In the mid-19th century, two conflicts over the opium trade ... open five ports to world trade, and limit its customs tariffs to five percent. In the second Opium War, from 1856-1860, Britain ...