A watershed moment is a critical turning point or decisive event that permanently changes the course of a situation, process, or history. It creates a clear "before" and "after," meaning that things can never go back to the way they were.
1947 was a turning point for sure. How much of it can be connected to roswell? Who else got debris from the site. What did they do with it. I would bet Bell Labs weren't the only ones involved.
Well Paperclip was 1,600 German scientists, engineers, and technicians in 1945 so they were in the right place at the right time. White Sands Proving Grounds (New Mexico) is only a short car ride from roswell.