A free opportunity to invade the mainland US on the backs of probably China and Russia.
Who in China or Russia is foolish enough to conquer the USA and win the right to feed 46 million food stamps recipients?
As a threat, this sounds ominous, but a true enemy would only stoke tensions within the country, divide the people on racial and cultural boundaries. He would also encourage spending of other people's money and abandonment of domestic industry. Public morale would be ridiculed and eventually cast away, starting with corruption of the children. After that the true enemy only needs to sit back and watch the show; the USA will be destroyed by the country's own population. Some say it's already destroyed, but the people are afraid to admit that. The real test is simple, though. Will the USA survive on its own if all other countries suddenly disappear? An independent country can do that. If a country cannot survive, it's a colony that lives off of someone else's industrial resources.