Mark Steyn‘s latest National Review cover story reminds that “two-thirds of a century” have passed since America last won a war. (Read on if you think he’s forgetting a victory here and there since the end of World War II.)

Steyn attributes the inconclusive actions in Afghanistan, Iraq, and Libya to a muddled sense of purpose in the use of the U.S. military.

According to partisan taste, once can blame the trio of current morasses on Bush or Obama, but in the bigger picture they’re part of a pattern of behavior that predates either man, stretching back through non-victories great and small — Somalia, Gulf War One, Vietnam, Korea. On the more conclusive side of the ledger, we have … well, lemme see: Grenada, 1983. And, given that that was a bit of post-colonial housekeeping Britain should have taken care of but declined to, one could argue that even that lone bright spot supports a broader narrative of Western enfeeblement. At any rate, America’s only unambiguous military triumph since 1945 is a small Caribbean island with Queen Elizabeth II as head of state. For 43 percent of global military expenditure, that’s not much bang for the buck.

Inconclusive interventionism has consequences. Korea led to Norks with nukes. The downed helicopters in the Iranian desert led to mullahs with nukes. Gulf War One led to Gulf War Two. Somalia led to 9/11. Vietnam led to everything, in the sense that its trauma penetrated so deep into the American psyche that it corroded the ability to think clearly about war as a tool of national purpose.