If, and it is a very big IF, the human race and our civilization survived the, probable, "Nuclear Winter", the United States, through the U.N. would establish a 'Pax Americana'.
(it; is; ) (the human race and our civilization; survived; the, probable, "Nuclear Winter) (the United States; would establish; a 'Pax Americana)
it the human race and our civilization the United States
is survived would establish
the, probable, "Nuclear Winter
a 'Pax Americana