US president Donald Trump’s decision to go ahead and impose 25 per cent tariffs on $50 billion of Chinese imports is the latest salvo in the four-month standoff the country’s been having with its key trade partners. It also comes on the heels of Trump's rejection of the consensus statement at the G-7 summit held earlier this month. Here’s a look at the events that have led to the escalation of trade tensions between the US and other countries.