This quote refers to a latin phrase "Quo Vadis?" or "where are we going" It is the essential question of philosophy: where do we come from and where are we heading?

It's possible u can use it to American or any other society. It is the basic question humans CAN ask and animals won't.

So it's up to u to see it in a narrow way as to what future the US has or what will happen to us all on earth one day in years to come. Where has humanity been and where will humanity be and where will humanity end.

I would draw a historic line from the primitive philosophies of fear of fire and gods to the rise of the sciences and the overpopulation concerns which may create a half earth of unlivable space and wars being fought to occupy the livable half.

Global warming should be a part of it as this is definitively going to affect the lives of generations after us.