Here is what it will take to actually get this pulled off:  Steps for Greenland to Join the U.S.:

1.  Negotiation and Agreement: Greenland, Denmark, and the U.S. would need to reach a consensus, respecting Greenland’s autonomy and addressing sovereignty complexities.

2.  U.S. Treaty Approval: A treaty would require a two-thirds majority vote in the U.S. Senate, necessitating substantial bipartisan support.

3.  Incorporation Decision: Determining Greenland’s status—whether as a state, territory, or another designation—would involve constitutional and political deliberations.