After months of delays, President Donald Trump's contentious tariff barrage is now in effect. It imposes a wide variety of new import duties that are the steepest seen in nearly a century and that affect all of the country's trade partners.

Trump announced on Wednesday that his administration will be imposing reciprocal tariffs on dozens of countries. Here's when they go into effect

Trump’s tariffs are an economic emergency. If implemented, the US’s average tariff rate would be higher than under Smoot-Hawley. They would constitute the largest tax increase since the 1968 levies to fund the Vietnam war.