Well, 13/13 needed to amend the Articles. The constitution, 2/3 of both houses of Congress plus 3/4 of state legislatures or national convention.
Truman Doctrine
In 1947, Truman pledged that the US would aid any nation in resisting the growing threat of communism to help prevent its spread.
the louisiana purchase and american mexican war
I think that in/ during a way you are there for one purpose. And, that's to defend your country. So.. No matter the outcome. You kinda did ask for that outcome. Nobody forced you to go to war. You trained your army for that day.