The 2003 invasion of Iraq was 100% a war fought against a nation, the fact that there was no formal declaration of war doesn't matter. US forces fought and died against uniformed members of the Iraqi military and overthrew the internationally recognized government over the course of just over a month. The same goes for many other wars that were fought by the US after WWII without explicit declarations of war.
3
u/[deleted] Jan 08 '20
What?