The United State Department of Agriculture's website has something called The Agricultural Tariff Tracker. It has a drop down menu listing all of the countries that have free trade status with The U.S.
Along with countries such as Colombia, Korea and Peru you will also see Wakanda.
It even has data inputs for Wakanda regarding things such as fresh vegetables, unroasted coffee, essential oils and livestock. What? No vibranium? Wakanda only exists in Marvel superhero movies and isn't real. A department spokesperson says it had been used for testing and they forgot to take it down. It's gone now.