The U.S. is often more concerned about hypothetical nuclear threats than the ones lurking all around us. Here are five to keep your eye on...
Yes, America is the most dominant military power on the planet—but it does have some weaknesses Iran could exploit.
If relations with Tehran were to turn sour, what means would be at Washington's disposal?
No alliance is perfect, but these five states caused America some major headaches.
Moscow would have its hands full if the unthinkable ever occurred.
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