The matter of international allegiance can take years for a player to decide. You only need look as far as the likes of Harvey Barnes and Elliot Anderson who both still have the call to make between Scotland and England, for example, at the ages of 26 and 21 respectively. For one young Rangers talent, though, he made a quick early decision with a mature head on his shoulders. Following a lengthy tug of war between Scotland and the United States, it’s the Scottish FA who can breathe a sigh of relief. READ MORE: Rangers to bank six-figures as Arsenal take Billy Gilmour and Rory Wilson inspiratio…