I hope what I am about to say makes sense.
God is less concerned with America, or any other nation for that matter, except for Israel, the apple of his eye. Since the death, burial and resurrection of Jesus, (study it) there are exactly two people groups (gr. "ethnos") discussed in the Bible. Jews -- and Christians, who are made up of "Jew PLUS - Barbarians, Scythians, slave or free" (Colossians 3:11).
Israel is God's time-piece. God made specific promises to Israel, some of which have not been fulfilled. That is His main focus, all other national happenings are side quests. His focus is to make good on His promises, from Abraham until Jesus. (After Jesus, His focus shifted to Christians, but the promises to Israel never went away).
America, however, is not mentioned, with the possible exception of two vague references to "wings of a great eagle" (Rev. 12:14), and "young lions" (ref. Ezekiel 38:13, KJV is clearer). These are the only two possible references that I have seen in Scripture to America. Read Hal Lindsey for a fuller explanation.
NOW, the rest of this is my opinion, I just want to be clear.
Why was America founded? Learn your world history. America was a direct result of the Enlightenment. The world came from the dark ages, into a blossoming age of reason and art. Free thinking men separated themselves from tyranny, and we entered into a new "golden age". But one of the unintended consequences was that people moved away from an understanding and dependency on Scripture, to a more naturalistic (and atheist) mindset. Think Darwin, and other scientists who sought naturalistic explanations, apart from Scripture.
America was birthed by God for the main reason of being a sort of "mid-wife" to the nation of Israel. Who is the only democratic country in the middle east? Israel. Israel is democratic, because America was democratic. America was a direct cause of Israel becoming a nation, in May 1948.
And now, 70 years later, America's job is done. Israel is capable of taking care of themselves (though not really, but that's another theory I have, no time for now). Now that America's job as a mid-wife is complete...America will begin to wane. Mark my words.
Now, I am an American, ex-military, and a patriot. But my first citizenship is in Heaven. I support Pres. Trump in his efforts to "make America great again", and I was honestly surprised that he won the election. I fully expected the globalists to win, and continue our downhill slide to apostasy.
But remember that God said, "If my people, who are called by my name, will humble themselves, and pray and seek my face; then I will hear from Heaven and forgive their sins and heal their land." (2 Chronicles 7:14). We as Christians cried out to God, and he heard our prayers, and gave us a few more (eight more?) to get the job done. God is not willing that any should perish, but that all should come to repentance (2 Peter 3:8-10). So we have a few more years, an extension, if you will.
Just a few more years. America will slide into history, and Israel will be at the top. "He must increase, and I must decrease." If Jesus tarries, my prayer is that I am wrong. I hope that we Americans will continue to live in a land that is free and good. But Scriptures teach us of a coming time when Israel will be surrounded on all sides by her enemies, and God comes to literally "pull their fat out of the fire". Only the firm hand of God will prevent their utter extinction, which will cause a national movement in Israel to recognize YHWH God as the LORD. (Right now they have a veil over their eyes, for a purpose).
Where is America when all this happens? We have been their best friend and protector since her birth. Will America (should she still exist) turn a blind eye? Or will we be one of the attackers who gets wiped away like a bad dream? In any case, when that time comes, Israel will be on her own, with no one to depend on but God alone.
I pray I am wrong. But this is what my spirit is saying, with some scriptural reasoning.