Keeping guns and honing combat skills — never a bad idea, based on time and money. No matter what we do, criminals will.
As for what you are specifically referring to, it’s called Balkanization. Multi-culturalism will inevitably result in that.
Arizona is working to diffuse multi-culturalism, not only with border security, but also this:
Arizona bans ethnic studies in public schools
http://www.freerepublic.com/focus/f-news/2512472/posts
Arizona Legislature Passes Bill Banning Ethnic Studies Programs
http://www.freerepublic.com/focus/f-news/2503811/posts
Sharia Law is another multi-cultural danger. Islam wants a separate legal system to allow barbarism in the US. That would result in Balkanization too. Louisiana is working on a solution to that:
Louisiana Outlaws Sharia Law
http://www.freerepublic.com/focus/f-bloggers/2507410/posts
http://loganswarning.com/2010/05/05/louisiana-bans-sharia-law
www.canadafreepress.com/index.php/article/22644
www.jihadwatch.org/2010/04/louisiana-outlaws-shari
When he took over a month to OK sand islands to protect La. wetlands that says a bunch.
When he(zero) finally does O.K. a few islands and only funds "one" for Louisiana that also says a lot.
We have a Manchurian muzzie in charge and are in for a lot of attacks from him until he is thrown out of office.