The American system is too big for most to look at closely. We only see the small microcosm of where we are at in connection with our experiences. This is how bad decisions are made: when someone does not have all the facts, and yet thinks that he does. I cannot tell you how many times as a pastor, I have had to tell someone that he did not have all the facts; rather than admit it, most would just say that they did had enough. That is what we call the spirit of rebellion because it does not focus itself on what is good beyond oneself, but rather on what it happens to want in that moment.
We might not know what the exact intentions are of those who founded this country, but no one (who thinks about what he is saying) can rightfully deny that America is a protestant country with protestant foundations (which is not exactly the same as saying "Christian foundations"), and not a Catholic country. When we see her at her spiritual roots, which is individual self-determination, then we see it in reality. How do the holy Scriptures refer to this, "individual self-determination"? The Word of God (hiding nothing, as it usually does) calls it: prideful rebellion and lack of submission. How can this ever be something we consider to be good?
We are so used to doing things the American way, that we take our justifications of our mother country too lightly, without any criticism. Essentially, the Catholic Church has been working on teaching people how to overcome that selfish "individual self-determination" for all two thousand years of her history. Some people hear it and accept it, but others want to stay in their sin, so they say things like, "the church no longer believes that" (which is usually either a grave mistake, or a demonic lie).
Thus, is America in good standing with God? No, (as in "N" and "O"). She is most definitely not. What we can see, however, is that we are all tempted to do things the "American way", which is usually not the godly way. It maybe countercultural and very uncomfortable, but the fact of the matter is that we cannot behave like the world; to stay true to what our Lord told us, is fully necessary for us to grow in salvation. To believe that every individual can and should make all of his determinations in this life, without anyone else interfering, is the error of the devil himself.
It may be uncomfortable, but the duties we have as faithful Catholics mean that we cannot be typical Americans. America, being founded predominantly by protestants (and a fair sprinkling of deists), its principles may sound close to the Catholic faith, but the fact of the matter is that they are not close enough. We have to be Catholics first, and our status as Americans comes after that. This applies to every area of life; including what you choose at the election box. Presuming that your vote is actually helping making a decision for our land (and that the whole thing is not rigged), cast your vote with obedience to Christ above all else.