Now red herrings. The USA has not (and, AFAICS, never) intervened in every hot spot on the globe. It has, however, controlled vital strategic parts of the world so that ascendant tyrannies could not take them over. Some of the biggest retreats under leftist presidents include abandonment of the Panama Canal (now under the de facto control of Red China), dumping the Monroe Doctrine (thanks to Kerry; invites “the world” into the USA’s back door, but you seem to agree with him on this, not understanding why we had said doctrine in the first place) and Obama’s weakness (most likely deliberate) in the South China Sea (surrendering the Philippines and other locations to Red China).
As far as Afghanistan goes, if Iran were to take that over and thus ally with already-nuclear Pakistan, imagine how much greater their power would grow. If there is a bad situation there, it’s thanks to the leftist leaders, as noted again. (Bush’s altered stance towards Pakistan’s Musharraf showed him to be among the leftist leaders the US has had to endure.)
Defaulting to socialistic Wilsonian doctrine (his re-election slogan was “He Kept Us Out Of War”) in opposition to Washingtonian alertness will serve us badly as it has for well over a century. And as far as the British Empire goes, we see the fruits of their retreat; Churchill was pro-Empire, but Attlee was pro-retreat and poisoned his own country with socialism (particularly following the bad Soviet lead on abortion).
We disagree!