The Bible, the book of Enoch and other Ancient texts speak of the Giants that ruled the Earth many years ago.
Amazingly, as the settlers moved Westward and dug into the soil they discovered the Remains of giant.
America is, relatively speaking, a new country.
Were There really Giants in days of old? Did all traces of the Giants of long ago vanish as new civilisations rose and fell, burying the graves and the memories of the Giants further below the surface.
The Nephilim; the Titans and so on.
The Bible, the book of Enoch and other Ancient texts speak of the Giants that ruled the Earth many years ago