I have told the story of Apollo 17, 18, and 20.
Yes, there are Aliens out there! Fortunately not all are hostile.
The Universe has been around for billions of years. Some Aliens are far more advanced than America. And, yes, they visit Earth! Even a billion years is an enormous stretch of time. A million years is almost unfathomable to us. So, intelligent Aliens that existed 30+ million years ago may be extremely advanced.
American science/technology is--behind the scenes--extremely advanced. On a par, really, with the old science fiction films. But some Alien Societies are far, far more advanced than America. America must move cautiously, maturely in dealing with these Alien Societies.