Do you like white chocolate?

[Smegma]

New Mexico 17.16 inhabitants per square mile

London 4542 inhabitants per square kilometre

UK , The United Kingdom's population in 2011 surpassed 62 million. Its overall population density is one of the highest in the world.

This is why you don't have wells and why aquaducts would be filled with crap in no time in your neck of the woods .

You're comparing one of the most sparsely populated states in the US to one of the biggest cities in the world. It's a meaningless comparison.