The United States lives in a fundamentally unique geopolitical reality. It’s the only major power that doesn’t face the risk of a land war, so it doesn’t need a massive force to defend the homeland. Instead, it can concentrate on maintaining control of the Atlantic and Pacific oceans. If it retains control of the seas, the only threat to the United States would be air and missile attacks. These are not trivial threats, but they are far more manageable without having to worry about an invasion by land or sea. The United States itself has offensive options it can indulge in – even if it doesn’t always use them prudently, and even if it leads to defeat elsewhere. The U.S. has not faced a foreign presence on its soil since the 19th century. Even nuclear weapons are countered by mutual assured destruction, which has protected the U.S. homeland for over half a century.
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