ieExplains: What are tariffs and how do they work?
In the US, tariffs are collected by Customs and Border Protection agents at 328 ports of entry across the country (Noah Berger/AP)
US President Donald Trump’s long-threatened tariffs against Canada and Mexico came into effect on Tuesday.
Imports from Canada and Mexico are now to be taxed at 25%, with Canadian energy products getting tariffed at 10%. In addition, the 10% tariff that Mr Trump placed on Chinese imports in February is doubling to 20%.
