The US, China and Taiwan have all signed onto a fiction — that Taiwan and China are one and the same government. Of course, the US doesn't completely go along with that, but for official purposes, it's been a useful lie for decades.
President-elect Donald Trump wants Mexico to pay for his border wall. One way he might do this, he says, is to stop people here from sending money back home to their families in Mexico. But that could actually backfire on him.