Politics: Do you think a country would ever do a full-scale invasion on USA?
The American Revolutionaries were whiskey drinking, gun smuggling, anti-tax, gun-owning, tough rugged hell-raisers. FACT
The 2nd amendment was written to allow average everyday citizens to arm themselves against their own government if the Federal Govt ever became tyrannical.
And if you think the Federal Govt is your friend, then understand this: In the Constitutional Republic of the United States of America, we have the US Constitution to keep them in CHECK for a reason!
USA! USA! USA!