Because the "imperialist" FDR was dead, idiot. Who should own Greenland is not the point. The point

Is Trump is not the only US president who expressed ambition on Greenland. So is FDR, our statesman. Trump just said something. FDR had actions, stopping canada and UK from taking over, sending US troops to Greenland, establishing the military base. The point is if you think Trump is an imperialist by simply saying something on Greenland, then FDR is a real imperialist.