is this moron going to start WW3

Yes.

because of Greenland?

Because he wants to suspend elections. Remember, he openly said during his last election that if he’s elected they won’t have to vote anymore:

• In July 2024, former U.S. President Donald Trump told a crowd, “Get out and vote! Just this time. You won’t have to do it anymore! Four more years, you know what? It’ll be fixed, it’ll be fine, you won’t have to vote anymore.”