http://download.geonames.org/export/dump/
here you can get all the countries geojson files..
check it out..
and there are lots of tutorials available to do the task you requested...
http://www.schneidy.com/Tutorials/MapsTutorial.html
http://techslides.com/d3-world-maps-tooltips-zooming-and-queue/
apart from these you need to search and find tutorial to learn much more concepts...
These two are the basic tutorials toβ¦
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