Doubtful, at least early on.I was thinking would there be some sort of NATO like American led entity in this world and which nations would be members?
While the US is easily among the Great Powers, the devastation of the SGW make it so that, at least in the early decades following the war, the US would be much more inward focused while it rebuilds and deals with the former CSA. It's not too dissimilar to the OTL British post-war experience, except that the US would have far greater resources available to it than the OTL British, thus would bounce back to Great Power status much more readily.
This bounce back would begin in earnest in the 1970s. The 1950s would be a difficult decade for the average American, with the late 50s seeing a vague stabilization start and the 1960s being the decade where that stabilization takes greater hold. Later in the 60s sees a tentative start to a proper economic recovery with the 1970s seeing this economic recovery take proper hold.
In the 1980s you will likely see politics take a more economically and fiscally conservative turn (though of course it's going to be a much less conservative conservativism than the OTL 1980s). It will also see America become much more gung ho in foreign affairs.