Most of the others do not spent anywhere near the amount of money on their militaries to even moderately threaten the United States. (That and in Cuba and Venezuela's cases, they are within what we consider our backyard under the Monroe Doctrine. Plus in Cuba's case, 90 miles is way too close for them to stirup anything without major backing).
North Korea has a massive army and spends way too much on their military, thus making them at least a moderate threat to overseas US forces, and a minor threat to the rest of he country if they can get a missile this far.
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