Donald Trump, the newly elected US president, has once again set his sights on Greenland, the massive ice-covered island in the Arctic. Known for his bold and unconventional ideas, Trump believes owning Greenland is crucial for America’s national security and global freedom.

This isn’t the first time Trump has floated this idea. Back in 2019, during his first term as president, he called it a “great real estate deal” and said Denmark, which owns Greenland, would be happy to sell it since...