Since the demise of the Soviet Union I can't see any scenario that would lead to a global nuclear war on the scale of Twilight 2000.
From a purely military point of view America is just too powerful at the moment for any rival to take on outside of their own territory. By 2030 the global situation could change, but unless America and China get into a really nasty trade war I don't see China even thinking about attacking American forces in the Pacific yet alone invading America. Mexico is not a militarily strong country and can barely control its own territory if we are reading the news correctly about insurgents and drug cartels challenging government authority. Mexican forces are more para-military than military; their navy is mainly coast guard standard and they have one squadron of F-5 II fighters. They would be woefully outclassed if they got into combat with American regular or even national guard forces.
On the other hand regional conflicts could lead to regional nuclear exchanges. Iran and Israel, India and Pakistan, the Korean Peninsula and the current situation in the Ukraine is not healthy. Plenty of material for nasty wars involving the Western powers, maybe tactical nukes being used as well.
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