If boat trips from a few hundred years ago are not a claim of ownership, then why should this just apply for Denmark in Greenland, and not also for the European colonizers in North America?
The United States is expected to focus heavily on maintaining dominance in the Americas, while still regarding China as a major strategic competitor in the Asia-Pacific.
Donald Trump has grandiose and sometimes extravagant plans to resolve conflicts across continents, but in reality he always struggles to implement them.