Check out Steve Judd for really sane mundane interpretations.
Understand that just because a planet changes sign, it's not like pushing a button on a computer screen and suddenly the whole scene changes.
What went on 248 years ago IS having its "return" but the surrounding planets in their transits were in different places.
Andre Kahr (another sane mundane astrologer) a few videos ago was talking about bearing in mind that astrology gives you an idea of which way the wind is blowing, tack your course accordingly. It is not predictive.
Nicholas Campion (another great mundane astrologer) once wrote about astrology not being predictive, and he said, even as far as we have come (I think he wrote this ca. 2000), given all we know, we still can't tell you if you are going to have a nervous breakdown or if your pipes are going to burst.
Re the birth of our country, most use the date of the Declaration of Independence, but there is no time -- however, consider the thought that Benjamin Franklin was present at the signing, and BF HAD to be an astrologer (or else know it awfully well) because he was the publisher of The Farmer's Almanac (which is based on astrology) -- BF was there but did not note the time of signing -- consider the possibilities of WHY he didn't make this known? (Example: I'm a musician. When I played a celebrity wedding, I would note the time of the "I do" to pass along the info to (my friend) Lois Rodden (Astrodatabank person.))
I also like Pam Gregory, Frederick Woodruff.
Given all the above, it's a very profound time astrologically and no one who knows anything (astrologically) and is in their right mind would tell you "it WILL happen like ..." -- but as I said, Steve Judd gives me the most concise info, and Andre Kahr.