Very good question, with over 20 trillion in debt we will see.
How many nations and/or governments, exist in perpetuity?
For example, the borders of the world have changed greatly over time. China has a long history, but the borders and government of China have changed. The current communist government there dates back only to 1949.
World War II and the Cold War brought about many changes in the borders of countries of Europe. The anti-communist revolutions of 1989 in eastern Europe caused fundamentsl changes in their governments.
Ditto when the Soviet Union fell apart into approximately 15 different countries starting in late 1991.
Czecholslovakia(sp?) split into the Czech Republic and Slovakia.
Governments come and go in various countries around the world.
Some people envision a time when California splits off from America, or America splits and evolves into a liberal America and a conservative America, as separate countries.
I was talking to someone, and told him I hope and pray we never see a revolution in our lifetimes in this country. He agreed. We agreed that whatever might replace our current government after a revolution, is virtually certain to make our lives worse off.