Ehh... what's everyone going on about here? Sure it can be fun to talk politics, but no offense PsyBorg... I really don't think a well armed population is that much deterrence to a military power. Just have a look at our experience in Iraq and Afghanistan. Two countries where just about every household had a fully automatic rifle as an accessory. Sure, we needed to take that into consideration, but it didn't stop us from jumping in. Arguments for self-protection via firearms is one thing -- and invalid if you ask me without proper training, but it's another to think it'll deter a military power with aviation, armor, naval assets and as many soldiers and firepower as their supply line can supply.
I digress, and it's just my opinion, but it's also based on 4yrs active duty as a 19D cav scout in an airborne capacity and 4 yrs as a reservist in an aviation unit.