The country that gave safe haven to Al- Quaeda. From which they plotted the 9/11 attacks on US. The government was removed by US maneuvers. The US botched their stay there due to no good plan on how to turn around the Afghan people. The afghans got a gift what a democracy could do for them. Number 1 was giving them a taste of freedom but it wasn't enough. When the chips were on the line, they compitulated mostly without a fight. A US skeleton force could have kept the status quo. Just to keep the taliban locked up near the mountains . Keep the elections legit and let them figure out the rest. No nation building. Give them guidance and that would of been that.
The US helped with the rebuilding of Europe after the war as well as the Phillipines and Japan. After the Korean War we fixed up south Korea. We could of did the same for Afghanistan. It would just have taken longer. You teach the kids in grade school to be a better them. After 3 generations you will have a more understanding generation able to face their destiny with way less violence.
We have to stick together as a nation to protect the world from another hell on Earth. Germany and it's allies tried to do this back in 1939 . It was a very strong US that was able to stop it. We did it because we stayed together after the Civil War.
Be a deep thinker. Look outside the box.