There are many Christians who have come to believe that the United States of America has been given promises from God that He will never let her fall.  Contrary to that:

I want Christians in the U. S. of A. to know that there are no promises to this nation of continuity, or perpetuity.

The promises given in the Old Testament are to the nation of Israel as a nation; and we have promises to those who are Christian through faith in Christ Jesus who bled and died on the cross, was buried, and bodily arose from the grave.

We  have the promise of Jesus that He will come again; and that is a  promise we can believe.

And if I go and prepare a place for you, I will come again, and receive you unto Myself; that where I am, there ye may be also.” John 14:3 (KJV)

“Behold, the days come, saith the LORD, that I will make a new covenant with the house of Israel, and with the house of Judah: not according to the covenant that I made with their fathers in the day that I took them by the hand to bring them out of the land of Egypt; which My covenant they brake, although I was an husband unto them, saith the LORD: but this shall be the covenant that I will make with the house of Israel; after those days, saith the LORD, I will put My law in their inward parts, and write it in their hearts; and will be their God, and they shall be My people. And they shall teach no more every man his neighbour, and every man his brother, saying, Know the LORD: for they shall all know Me, from the least of them unto the greatest of them, saith the LORD: for I will forgive their iniquity, and I will remember their sin no more.” Jeremiah 31:31-34