Why are you so confused? The scriptures that describe America (BABYLON THE GREAT) are so very clear.
At this present time America is indeed the mighty BABYLON THE GREAT, but at some point in time (and I feel it's going to be very soon) God is going to judge and destroy America, after which we will cease to be the powerful nation that we are today. When that occurs, Revelation 19:1,2 will be fulfilled which says,
"And after these things (after America's judgment) I heard a great voice of much people in heaven, saying, Alleluia; Salvation, and glory, and honour, and power, unto the Lord our God:"
"For true and righteous are his judgments: for he hath judged the great harlot, which did corrupt the earth with her fornication, and hath avenged the blood of his servants at her hand."