>>1901944>Red>250 - 1250 people/ sq mile>US map >>1901940>250 - 500 people / sq mile>Goldish-yellowcongrats on not comprehending difference in color-grading for statistics
here's what the US map would look if it had the same color grading key for (roughly) the same metrics as the euro one you posted
within the regions that are akin to european density, why couldn' there be a highspeed rail to link up cities?