Um sujeito na Irlanda

A trade war has been put in place since Trump stepped into the White House, for example when he cancelled the TTIP and this war has became more explicit during his second year in the office.

Trump has already declared this trade war to the world and the indications are that he could make it more intense. The US, just like the UK, have a hegemony that allows them to push to some radical measures and protectionist decisions because their power are sustained through foreign dependence, in particularly from the neighboring Latin American countries. Those countries need the US more than the other way around. However, Trump's action has nothing to do with protectionism, something fundamental for any country that seeks for autonomy and independence, but this action is a type of sanction or, "boycott" that does not usually bring to good outcomes, neither to the actors that promote them (in this case, the US) nor to the ones that will suffer the consequences of it (Canada, Mexico, China, Brazil...).
Take Russia, increasingly isolated, dedicating itself to intense militarism and trying to regain its influence, Putin once said that the perestroika was the worse thing that could happened to them.

Trump's intentions are apparently good, he wants to reverse the damage caused by globalization, but as Adam Smith predicted, liberalism could export the trade but not the workers, keeping this way the cheap and exploited labor in China, for example. Something that he seems not to understand. This shift in trade is stupid and risky, a typical maneuver from a businessman who has gone into bankruptcy many times.