Trump’s March Madness of tariffs has a confusing, changeable schedule. Here’s what we know

// custom header art window.tgam.meta.photo_desktop = "https://www.theglobeandmail.com/resizer/v2/3ZTPEO2JCBDKZJZDRWFARNTWRE.jpg?auth=3090d709610fbbc8ed2dce842e1bc49600044121f43655c2203f6b2f95a1ed4b&width=1920&quality=80"; window.tgam.meta.photo_mobile = "https://www.theglobeandmail.com/resizer/v2/OV4B2U7H4BFCTCKWO326V4KCUU.jpg?auth=01cc0fe64491bf94f94db89371f2f3461559ea9da5317201051a9eee15ccd8de&width=1200&quality=80"; window.tgam.meta.video = ""; window.tgam.meta.caption = ""; window.tgam.meta.credit = "Photo illustration by The Globe and Mail (source: Getty Images)"; // custom header layout parameters window.tgam.meta.headline_overlay = true; window.tgam.meta.headline_overlay_vertical_position = "bottom"; // top, centre, bottom window.tgam.meta.headline_overlay_horizontal_position = "centre"; // left, centre, right window.tgam.meta.headline_overlay_gradient = false; window.tgam.meta.two_column = true; window.tgam.meta.swap_column = true; window.tgam.meta.full_width = false; window.tgam.meta.dark_background = true; window.tgam.meta.dark_background_colour = "#000000"; window.tgam.meta.centre_headline = true; window.tgam.meta.large_headline = false; window.tgam.meta.sans_headline = false; window.tgam.meta.label_text_colour = ""; window.tgam.meta.label_box_colour = ""; window.tgam.meta.label_text_colour_overlay = "" ; window.tgam.meta.label_box_colour_overlay = ""; window.tgam.meta.audio_bar = true; // custom header display overrides (optional): window.tgam.meta.display_head = "A countdown to Trump’s March Madness of trade"; window.tgam.meta.display_deck = "The deadlines for U.S. tariffs on Canadian goods are fast-approaching, confusing and quick to change. Here’s what we know so far"; window.tgam.meta.label = "Explainer"; window.tgam.meta.byline = "Mark Rendell"; window.tgam.meta.byline2 = ""; window.tgam.meta.creditline = "The Globe and Mail"; Donald Trump’s tariff threats have come fast and thick. Every other day, it seems, the U.S. President lobs a new grenade at the international trading system: across-the-board duties on imports from Canada and Mexico; “reciprocal” tariffs on all countries; industry-specific levies on steel and aluminum, automobiles, lumber and copper, to name a few.