Coping the same website to many different sub domains, can be cause to i get in the google black list?

[PHOZEEX]

hi guys, i am totally new on web design and seo, now i am creating 40 different sub domains under my main domain lets say each sub domain is a city name, because i want to sell my products on all these cities! now but the ebsite is same website! only meta tags on the website is different! it is related with the city names. is that gonna be the problem and am i gonna get in to the black list or no? i mean since articles are same but it is under same domain! just adding a sub domain to it. Please help

[Jake]

If not a penalty, duplicating content on multiple pages will not rank well in the search engines, you can block search spiders from these duplicated pages with a robots.txt file if they are just for filler and not search ranking.

Normally one would use a canonical tag to indicate which is the master copy of some content, which causes only that master copy to rank.

Some articles on that subject on an authority site:

http://moz.com/community/q/new-client-wa...ort=oldest

http://moz.com/community/q/multiple-citi...te-content

http://moz.com/community/q/multiple-site...te-content

http://www.smallbusinesssem.com/how-to-c...ties/6532/

By Google's SEO spam master
http://www.mattcutts.com/blog/give-each-store-a-url/

[Bigb 007]

Yes 100% thats called doorway pages.