Note sure how the USA would figure directly into the book of Daniel except as gleaning from a prior model and applied abstractly to current or recent events. If the states of America were somehow token of a continuation of a kingdom of the saints that would be thing. As for the post-Daniel 2 & 7 world, the day of Pentecost on 33 AD might be far more significant not to mention events transpiring after 65 A.D. through to 70 A.D.