USA local search engine
 

Hello everybody.
I'm developing a website, oriented to products and services for local users. For a lot of reasons I would like to create subdomains for each state of USA. As my own site is still mostly in my mind, to get an idea of what I'm looking for - you can look here Illinois real estate or here New Hampshire fsbo properties (this is certanly not the best example of webdesign and usability, BUT those guys made EXACTLY what I need from the point of view of subdomains).
So my question is the following: how is it better to configure DNS and web-server to make the same way (I will use linux hosting). Truly speaking I know how to make it working for 3-4 subdomains but if we make 50 different independent subdomains - the maintenance and support will by very difucult.
Thank you in advance.

Google consider each sub domain differently so you have to optimize each sub domain separately to get best traffic from search engines.