perhaps, arguably the biggest stain on American foreign policy and wars was the vietnam war.
https://thevietnamwar.info/us-presid...e-vietnam-war/
Totally disagree with you the biggest stain is still on their shirts, the middle east. Destabilizing almost every country starting with Iraq.
The excuse was bringing in democracy but the real excuse was OIL. Now the mess is being left to rot in Iraq,Syria,Iran,Lybia........
They continue to be a proxy mercenary army for Saudi Arabia another "false" country created by Great Britain.