yes, they have in the past
but they will just be fighting for spoils of war as armed groups
or they will switch to protecting the warlord running the area they are in
or they could just go old school
and start a massive civil war leading to / combined with collapse of transportation, food supply lines and stoppages of gas and elec
worked in a lot of mideast and eastern european countries
they have updated it in 2020
now predicting 99 million population in 2025 instead of 69 million
"who's deagel?"
deagel.com
a very indepth website of all countries
mostly military info
a "part-time non-profit" that has posted 25,000 articles in 20 years
and makes "war game" type predictions about the future of 189 individual countries
interesting reading