erosion of legitimate authority to make collective decisions,
an inability to provide reasonable public services, and
an inability to interact with other states as a full member of the international community. (Still some semblance of this)
As a consequence of that and Obama’s immigration policies the US are going to experience an upsurge in illegal immigration. The prospect of a failed state on the US border could be as dangerous as a Jihadist one. Mexico is inherently and historically an unstable country, and there is every indication the situation will only deteriorate. The US may well have to shift its priorities (and troops) from Afghanistan and place a heavy military presence on its southern borders.