This is a demo tutorial. While there is no step-by-step commentary available (yet), the live demo below is fully functional. Feel free to open it for full source code.
This demo shows how we can automatically load and show country sub-divisions (e.g. states) when the map is significantly zoomed in.
See the Pen amCharts 5: Show country sub-divisions on closeup by amCharts team (@amcharts) on CodePen.