That’s because we protect them…
From Grok:
Yes, the United States plays a significant role in protecting Denmark, primarily through their mutual membership in NATO (North Atlantic Treaty Organization). Denmark joined NATO in 1949 as a founding member, and the U.S., as a leading NATO ally, is committed to the collective defense principle outlined in Article 5 of the NATO treaty. This means that an attack on Denmark would be considered an attack on all NATO members, including the U.S., prompting a collective response.
Additionally, the U.S. has a specific bilateral arrangement with Denmark concerning the defense of Greenland, a self-governing territory of Denmark. The 1951 Defense of Greenland Agreement allows the U.S. to operate military bases, such as Pituffik Space Base (formerly Thule Air Base), on Greenland. In return, the U.S. provides security assurances that indirectly bolster Denmark’s overall defense.
While Denmark maintains its own military and contributes to NATO operations, its relatively small size and strategic position in Northern Europe mean it relies heavily on the alliance—and by extension, the U.S.—for protection against larger threats, such as potential aggression from Russia. So, in short, yes, the U.S. helps protect Denmark, both through NATO and specific agreements.