The U.S. has a lot of leverage over trade—but using it is not as simple as it seems.

President Donald Trump said Tuesday that the United States would take control of Greenland "one way or the other," escalating months ... we welcome you into the United States of America," he said ...

Commerce Secretary Howard Lutnick said Wednesday that Canada becoming a U.S. state is the “best way” to merge the two countries’ economies. “The best way, the president has said it, the best way to ...