Empire? This nation wasn't built like every other nation anyway, with the new technology we have 'falling' like civilizations of the past is impossible.
Why will the U.S. crumble?
Energy. But by this time, a lack of energy will have a grip on the entire world.
With the new technology they had, they thought falling was impossible. There are too many ways the end could come for people to be over confident and say "never in our lifetime".
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