There is a video here that shows this from this video index:
It shows a multi-layer example using 1) Area Layer that then drills-down into a 2) a bubble layer.
Shapefiles are another source of geo-spatial data, you can read more about what a shapefile is here: What is a shapefile?—Help | ArcGIS for Desktop - it is a common format for storing GIS data: https://www.gislounge.com/shapefile-viewers/
Example shape file withe coresponding .dbf data:
Let me know if this helps.
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