President Donald Trump did not rule out military force to acquire Greenland in an interview as the Danish territory continued to rebuff his advances.
Archived version: https://archive.is/newest/https://eu.usatoday.com/story/news/politics/2025/03/29/trump-greenland-military-force-denmark/82722287007/
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Each of those you mentioned, except Korea, included Congress approval. Vietnam was approved by Congress with the Gulf of Tonkin Resolution (1964). Iraq was approved with the Use of Military Force Against Iraq Resolution (2002). Afghanistan was approved by the Congress Joint Resolution (2001). I suppose it’s the fine line between “military force” and “war”.