What happens if one NATO member attacks anohter?

As the title says what happens if one NATO member attacks another? WIth Trump threatening Denmark over Greenland and Panama over the canal, what would and should other NATO members do? Personally I think they could kick America out of the alliance, Trump is threatening Canada too, albeit with serious economic sanctions, but is this any less an act of war than a military option? What does he want Canada for anyway?

People think it's all just noise and that he won't do any of these things once in office, I'm not sure I believe that, I think there's every chance he will.

Parents
  • Unfortunately, the majority of Americans are neither well educated nor well informed. This is the reason that they elected a narcissistic, amoral moron as president, twice. However, the idea that the majority of the US people would embrace imperialistic annexations of the territory of other sovereign nations, allied nations, is misplaced. 

Reply
  • Unfortunately, the majority of Americans are neither well educated nor well informed. This is the reason that they elected a narcissistic, amoral moron as president, twice. However, the idea that the majority of the US people would embrace imperialistic annexations of the territory of other sovereign nations, allied nations, is misplaced. 

Children
  • But would they do anything to prevent it!

    I can’t believe there aren’t protests in the street already.

  • Are you sure about that Martin? What I've seen over the past years of watching America's foreign adventures, I think they're quite happy to believe that the rest of the world would welcome them with open arms, but they don't know what to do when people don't welcome them, when it costs money and lives. America seems to leap into war with it's head in a pillow, thinking all they have to do is turn up and offer maccy d's and disney and everyone will be happy.

    A majority of people may not embrace imperialism, but that dosen't mean they're not going to get it.