Ok so first things first create the pie chart but turn your country dimension into a master item.
You will be able to assign colours to your dimension values. US=red etc...
The great thing about this is the colours will apply across any chart that supports library colours.
Then create the pie chart and in colours use library colours.
Then you will be able to bring your chart image into nprinting.
In that case youll be bringing the data in raw from a table and then building the chart using that defined data source and the capabilities of excel or PowerPoint. I've done it with piviot tables as you cannot bring them directly in nprinting but I've always let Qlik do its thing with the other charts.