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• Country, state and region outlines: Natural Earth (public domain), through the world-atlas and us-atlas packages (ISC licence) and processed with topojson and d3-geo (ISC).
• City locations for the capital pins: Natural Earth populated places (public domain).
• Country flags: country-flag-icons (MIT licence).
• US state flags: us-state-flags (ISC licence), with names removed from the artwork.
• Canadian province flags: region-flags package; the underlying images come from Wikimedia Commons, so check each image's licence before reusing it elsewhere.
• Australian state and Italian region flags: circle-flags (MIT licence).
• German state flags are simplified drawings made for this site and are not official artwork.
• History maps are approximations built from modern borders and are for study only.