If tariffs evolve from a negotiating tactic to a new normal, economic and diplomatic costs to all of North America will grow.

President Trump has offered a mix of reasons for upending global trade relations, baffling and angering America’s biggest trading partners.

Arizona producers of vegetables, cotton, dairy products, tree nuts, beef and forage could see reduced exports and lower prices as a result of tariffs.

Let's take a look at four things investors should know. A blanket tariff of 25% is now levied on nearly all goods from Canada and Mexico, with the notable exception of Canadian energy products — think oil and gas — which come with a 10% duty.

Consumer and corporate optimism have faded in recent weeks as markets began to contend with the possible consequences of Trump’s agenda.