Major Trade Wars Since The 19th Century

The 25th US president, William McKinley, seen here on a 1956 US Treasury note, is an inspiration for Trump's protectionist policies (Credit: AFP)

As the world reels from US President Donald Trump's tariffs onslaught, here is a look back at some major trade wars since the 19th century:

In the mid-19th century, two conflicts over the opium trade, which became known as the Opium Wars, pitted China against the British Empire.