Simple: Which wars were "Justified" wars for America to enter into, and how greatly, on a scale of 1-5 (For purposes of the poll, vote yes for a 3, 4, or 5, no for a 1 or 2.)
I reject your premise OP that justification has anything whatsoever to do with the actions of a sovereign state. You cannot judge the actions of a nation state on the basis of morality or ethics as they are applied to individuals. The individual has a role and responsibility in relation to other individuals and to the state; to live in peace in the first case and to submit to standards of behavior in the second. You can apply these sorts of judgements to a limited extent to the individual.
The state in contrast has the responsibility to protect its citizens and maintain order, towards other nations and the responsibility to respect national sovereignity and to honor commitments. You may judge the nation-state's effectiveness or reliability but trying to judge it on this basis is senseless because all moral and ethical standards are subject to sectarian, ethnic, racial, and religious biases. No such global standard exists to bind nations. The international standards and laws that have adopted over the course of history are mere diplomacy.
5. The war was completely justified, and handled ethically in most or all ways.
4. The war was mismanaged, but was morally justified
3. The war was either morally questionable but I lean towards its support, or grossly mismanaged but ultimately a good idea.
2. The war was morally questionable AND grossly mismanaged, or it simply had a very weak moral basis to begin with.
1. The war was blatantly wrong.
?. You don't know enough about this war to say. For this vote, don't check the war in the poll.
Your scale is pretty irrelevent as shown above. A better scale would speak to key issues such as the violation of sovereignty or treaty. You are also misusing the term war. A revolution is not a war nor is an action against a terrorist movement a war.
As for my opinions:
Revolutionary War: 100% OK. Right to secede is a right. 5/5.
No there is no right to secede. This was a rebellion. Rebellion are not right or wrong they either fail or they do not.
War of 1812: Ditto, we were attacked for refusing to trade. 5/5.
I do not actually know much about this one.
Mexican/American War: We had some moral basis because Texas wanted to secede from Mexico and all but asked for our help. However, the fact that part of the reason Texas wanted to join us so we could have slaves taints it. Also, I don't think we should invade anytime a territory wants to secede from the mother country. In general, these wars should be fought by the Revolutionaries themselves. 3/5.
The US doctrine of Manifest Destiny was the foundation of this War. You could make an intellectual argument that it has both similarities and differneces with Hitler's Lebensraum. I contend that morality has no purchase on these concepts.
Civil War: The only "Coup de grace" to this was post 1863 when we were actually fighting to free slaves. But until that point. The war was simply wrong. 2/5 just because of the Emancipation Proclamation.
Well you are consistent, stating that the South has the right to secede. I disagree, no such right exists, but as a Southerner I would and will always support Southern independence not on moral grounds but based on the fact that The War of Northern Aggression injured my section and my ancestors by force. I would like to see retribution for the offense.
Spanish American War: As far as I know, the only basis for this was them supposedly sinking our ship. 1/5 totally unjustified.
This one I am not too familar with either.
World War I: A European War. Not our place. And while Germany sinking our ships was extreme, they DID have some justification because we were de facto supporting England. It wasn't like we were just going our merry way and they attacked. 1/5.
I am not sure US participation was necessary.
World War II: Totally justified, Hitler was a rampage who needed to be dealt with. 5/5
Totally necessary.
Korean War: Justified because North Korea was one of the worst countries to live in, and it wasn't a good idea to let South Korea be forced into it. Bad because we grossly mismanaged it (We didn't get rid of NK) AND it was morally questionable (We were supporting a dictator.) 2/5, though it could have been raised to 3 or 4 with proper technique.
MacArthur was right. Communism and its half brothers socialism and progressive liberalism are the prime threats to liberty and should be resisted and attacked by all means including military force as a practical necessityindependently of those pesky and irrelevant moral considerations
Vietnam War: We drafted people to fight a war abroad, only to lose. This by fiat makes it 1/5. Not to mention it was morally wrong (South Vietnam had the WORSE dictator) and mismanaged.
You probably can figure out how I feel about this one based on my comments on Korea.
Gulf War: Mismanaged (If we were going to do it, THIS is when we should have kicked Saddam out) but not morally a bad idea (An innocent country was being attacked.) Plus, no draft was used. 3/5 I suppose.
Certainly appropriate and well done right up to the decision not to take out the regime.
Afghanistan: This was justified, as we needed to catch Osama, but it was probably mismanaged in some ways. 4/5.
Hubris. The idea that we can build a nation here that can somehow deny terrorists a base of operations is plainly ludicrous as we have seen as militants spread like wet gremlins. But the real tragedy here for the US is that this occupation threatens to change the nature of our military from a combat force on the eve of the third world war.
Iraq: NOT needed, and mismanaged. 2/5, NOT 1/5 because I do think Bush believed it was a good idea, and there were some benefits, it just wasn't the best thing.
The Iraqi war was clearly nonsense. Violation of national sovereignty for no good reason which damages our standing in the world. The attempt to nation build and institutionalize democracy is a fool's errand. Destablized the region. Bush's folly and the worst foreign policy blunder in US history.
Libya: Speaking against Bush's wars, then starting your own? 1/5.
This isn't a war. It constitutes stupidity in its highest form and nothing good will come of it. Even if the rebels there turn Libya into a pro-US secular liberal democracy, which isn't likely, the message this action sent to the rest of the world is simple. The US can't be trusted, is an out of control bully, and everyone needs to find alternative allies and develop nuclear weapons to protect against future aggression. Literally a moronic tampering with Pandora's Box. Might turn out to be a bigger blunder than the Iraqi invasion. BTW, you should couple US support for rebels across the Arab spring with this action. The entire nonsense is setting the stage for a future global conflict. George Washington is spinning in his grave and if you don't believe it please refer to the recent damage done to the Washington Monument.
Poll Coming.