Subdivisions Impose Social Divide:
Here's a Washington Post article that finds room for a comment from me:

"It is the sort of strange effect that Evan McKenzie, author of the book 'Privatopia,' thinks county and other governments are only beginning to grapple with. The very concept of local citizenship is changing, he argues, as people are identifying less with such public entities as counties and more with their private developments and homeowner associations, which largely have assumed the role of governments. 'I think we're at a brave-new-world moment here,' McKenzie said. 'I think we're going through a major revolution in urban governance, and we won't fully understand the consequences of this for 50 years.'"