What the hell is so great about NATO?

  With respect to this Trump move on Greenland, there is this big fear of how it affects NATO.

  What the hell has NATO ever done for the USA?  Please name just ONE THING.

  Instead, the USA has spent billions ( maybe trillions) on defending this real estate. It isn't ours, and I don't think they are very good allies at all.   They get hysterical any time Trump asks for something.   Same goes for Canada.

  With "friends" like these, who the hell needs enemies?

  I don't get why Trump is so insistent upon acquiring Greenland, but what I notice most is how our "friends" don't seem so friendly.   This is supposed to help defend Greenland better, and it isn't like the Danes spent a fortune on defending it, nor do they bleed for it.  If Russia or China tried to take it over, what would they do about it?  Probably call upon America to save them again.