Dick Cheney's nation-building scheme has worked in Iraq, I would say; almost in Afghanistan!

If Trump gets a chance, maybe nation-building will ultimately work in Gaza!

To build a nation, takes a lot of time; and clearly, the fact that drugs were being cultivated in the farmer fields of Afghanistan turned many Americans off from financially supporting the Kabul government any further.

But Iraq appears to have done better.

The point is, the United States needs to plan the nation-building project as it learns from each existential project undertaken.

My opinion. 

P.S. Be it noted that Russia had backed out from its project in Afghanistan years before Biden's hasty pull-out.