it is the army of cold, calculating strategists behind the scene that sets out the overall geopolitical strokes of the country to dominate both its allies and foes alike
They haven't had those at least for a while now. I dare say since George "Mission Accomplished" Bush days and it has been on a steady decline since then. Blunders like ISIS, Libya, Syria, the back-and-forth with the Iranian deal, the overuse of the threat of sanctions even on allies.
The last of its calculating Kissinger-like strategists was Madeleine Albright. From then on, is mostly failsons like McFaul, Frum and Bolton, at least the ones they have been listening to.
Despite all the efforts of its rivals for the past 200+ years, it has not only endured and prospered, but also remain the most powerful military force for 70 years and counting.
Empires do tend to last 200 years on average, so the US isn't particularly exceptional on this either and it coming to an end would fit the historical trend.
but rest assured their foreign department is as shrewd as back in the yesteryears when the US would roll over central America to get cheaper fruit.
I'm guessing thats why a coup in Venezuela got blunted by a bunch of fishermen. It was the plan all along, right?