More recently, I very much doubt that engineering marvels like the Hoover Dam, Golden Gate Bridge, Holland Tunnel, could be built today.
Not because the engineering talent doesn’t exist…its because the necessary permitting, environmental impact statements, etc. wold take decades to complete. And you would always have some nutbag group protesting it, even after all the hurdles had been cleared.
Look what happens when you try to reduce carbon footprints (by building a nuclear power plant)-the protest groups come out of the woodwork-and tie you up in court for years.