[didibus]

There's tons of examples:

North Korea, after the Korean war, their living conditions got way way worse than when under Japanese occupation, even though their military has improved.

Afghanistan, since it's been overtaken by the Taliban, even though they are mightier from a military standpoint, the living conditions have become worst.

The Soviet Union post WWII, they came out of it as a military superpower, but the damages from the war meant their living conditions were way worse.