Is the USA in the Book of Revelation at all? If not does it mention our demise? Where is the USA in the end times?

Many Bible teachers have tried to find America in the prophecies of the Bible. Some have included America with the "young lions" of Ezekiel 38:13Sheba, and Dedan, and the merchants of Tarshish, with all the young lions thereof, shall say unto thee, Art thou come to take a spoil? hast thou gathered thy company to take a prey? to carry away silver and gold, to take away cattle and goods, to take a great spoil?
See All... who weakly protest the spoiling of Israel or in the reference in Ezekiel 39:6And I will send a fire on Magog, and among them that dwell carelessly in the isles: and they shall know that I am the LORD.
See All... to "them that dwell carelessly in the isles." Others have seen America in the first of the four great beasts in the vision in Daniel 7.

Daniel 7:4The first was like a lion, and had eagle's wings: I beheld till the wings thereof were plucked, and it was lifted up from the earth, and made stand upon the feet as a man, and a man's heart was given to it.
See All... - "The first was like a lion, and had eagle's wings: I beheld till the wings thereof were plucked, and it was lifted up from the earth, and made stand upon the feet as a man, and a man's heart was given to it."

The lion is supposed to represent Britain and the eagle's wings America. The plucking of the wings represent the diminishing of the power of America to a place of inconsequence. Though I find this interpretation compelling, I am not confident that it is definitely a reference to America.

Specifically, you ask about the United States being mentioned in the Book of Revelation. I do not know of any clear reference. In Revelation during the time of the tribulation, the antichrist is given power over the nations (Revelation 13:7And it was given unto him to make war with the saints, and to overcome them: and power was given him over all kindreds, and tongues, and nations.
See All...), Babylon will make "all nations drink of the wine of the wrath of her fornication" (Revelation 14:8And there followed another angel, saying, Babylon is fallen, is fallen, that great city, because she made all nations drink of the wine of the wrath of her fornication.
See All...; 18:3
See All...), and the great whore who represents the false religion of the tribulation sits on the "peoples, and multitudes, and nations, and tongues" (Revelation 17:15And he saith unto me, The waters which thou sawest, where the whore sitteth, are peoples, and multitudes, and nations, and tongues.
See All...). By the sorceries of Babylon "were all nations deceived" (Revelation 18:23And the light of a candle shall shine no more at all in thee; and the voice of the bridegroom and of the bride shall be heard no more at all in thee: for thy merchants were the great men of the earth; for by thy sorceries were all nations deceived.
See All...). If the United States exists during this time, it will also be caught up in the perversions of the times as one of the nations.

I know that there are other places in the Bible that some claim refer to America, but I cannot think of them now. There is a speculation in all of these claims. However, one thing seems clear. The United States is not a major player in the events of the tribulation. We read about Europe, the Middle East, the Far East, and North Africa as places of importance in the books of prophecy. If the USA is there, it is evidently a minor player. Although the country could be destroyed before this time, that does not have to be the case. But it is certain that America is not the world power it is today. That should be a sobering thought to all who would put their hope in an earthly power. All nations and empires rise and eventually fall. America will be no different. Our hope is in God; not in the stars and stripes. I love my country, but I love my Lord much more. One is forever; the other is not.