There is a reason why Trump has been wanting to buy Greenland since his first administration.
It's all part of his trade war with China.

China used a company called Greenland Minerals to get their hands on valuable minerals in the country.
Chinese company, Shenghe Resources Holdings, is the largest stakeholder in Greenland Minerals. So they have been essentially mining and moving their way into Greenland for years now.
China is essentially processing rare earth concentrates that contains the radioactive elements uranium and thorium.
So this isn't just for some meme that Trump is doing this.
The land has strategic value.

Around the exact same time that Trump first brought buying Greenland to the forefront, he told reporters that he was the "chosen one" to win the trade wars with China.
Listen to him closely in this last clip:
"Over the last five years, China has made 500 billion dollars. Ripped it out of the United States. Somebody had to do it. I am the chosen one. So I'm taking on China on trade. And you know what? We are winning. We are the piggy back, we are the ones that all these countries wants to rob and take advantage of. I was put here by people to do a great job and that's what I am doing."