All of it could still be used. At least that way they can spend more money on buying the same things again.
The border wall costs $6m per mile, reportedly.
The Taliban wouldn't need to cheat, they'd probably just win a free election if they had one in Afghanistan. Samo.
For a leader, these non-Western, non first-World countries might have limits to who is eligible to be a candidate, but that's not unique.
The British Empire preferred Arab monarchies, Arab republics. They seem to be more stable and work better. Completely secularlized countries like Morocco, relatively stable, have a monarchy. Other monarchies like Iran Egypt, didn't really withstand modernizing pressures and ideologies like the various socialist and nationalist ones that popped up.
A monarchy has a certain claim to a certain territory. It's harder for them to legitimize saying Oh and now we want to rule this other territory.
There are no countries outside Africa whose economic security depends on Africa. Israel, Turkey are relevant. Maybe we can talk about Ethiopia, Somalia, Somaliland, even Sudan, is just part of the politically-extended Middle East. ... Africa isn't unique in being a geopolitical backwater. Most of Latam is also, with very stable borders and few existential issues for anywhere else. If your continent has no great power, it's in pretty good shape, because no one has the power projection to mess with you and no foreign powres are trying to intervene. If Brazil becomes a superpower, China and US might have an interest in messing with them in their relations with Argentina or whoever.