The phrase "who controls the past, controls the future; who controls
the present controls the past" can be taken in differently by
different people, however this expression to me means that the actions
taken by leaders and citizens of our past, have a certain power over
what happens in the future. In 1984 Big Brother can foretell the
future, this also lends understanding to the first part of this
phrase.
However, what happens if Big Brother foretells in future incorrectly?
That is simple, the Ministry of Truth will go back and rewrite
history, so that Big Brother will be right. This is where the second
line comes in, "who controls the present, controls the past".
If America was not in control of the present right now, we would be in
utter chaos. Who are we kidding, we are in chaos right now and we are
in control, although it may seem like the citizens have no say
whatsoever with what happens to the nation we inhabit. If America were
to hand over it's power to any other nation, right now at this very
second, we would be vaporized, just like in 1984.