Seidu Mohammed and Razak Iyal couldn’t go back to Ghana, out of fear of persecution, and they couldn’t stay in the United States without facing deportation. So on Christmas Eve 2016, they headed north from Minneapolis to the Manitoba border and Canada beyond. It was a brutally cold December night. The men walked for hours. A trucker discovered them beside Highway 75, near Emerson, Man., half-frozen, expecting to die.