Post-WWII USA would give you Pax Americana, as long as you had no domestic defence industry.
From the US perspective, what's frustrating is extent to which European powers, particularly the largest and potentially most powerful, have allowed their readiness to decline. I remember a particular surprise readiness exercise a few years back in which the Germans were able to get no more than a dozen tanks moving within the first 48 hours. The rest were broken, undergoing maintenance, or had been cannibalized for spare parts. At the time Germany had, on paper anyway, about 300 active tanks.
It's not the sexy stuff like new missile systems and strike fighters that have been neglected. It's the boring parts that really matter like an efficient reserve system, logistics, spare parts, boots, training facilities, ammunition, fuel depots, etc.
Nobody wants to spend a lot of money maintaining a military in peacetime, but an effective peacetime military is insurance: When you don't need it you don't need it, but when you need it you really, really need it. Your country's strategic situation can change really quickly.