Ulrikke Andersen has already made a plan. If the United States invades Greenland, she will flee her home with her daughter. “Before, I was ready to die for my country but when I had a kid that changed everything,” she said. The 40-year-old is one of many residents of the Greenlandic capital, Nuuk, now weighing up options they would never have considered just a few months ago. But US President Donald Trump has been clear about his desire to seize the vast, self-governing Danish island, rich in...