Think about it... at one time Rome ruled the world. England ruled the world. Spain was a major player. Russia........ The US.
They don't have to destroy us, they just have to disempower us to the point of irrevalance. When we no longer can live like we used to. When our standards slip to that of a third world country (and it's heading there, don't kid yourself), when we've bankrupted ourselves maintaining the industrial military complex at the expense of our education system ... they win becasue we're not able to play the game any more.