China is a mixed economy- the strongest fastest growing economy in the world. An example of a mixed economy where government regulates capital allocation but allows enterprise where it strengthens the economy and crushes where it threatens to become a parasite. The US once did this too- prior to neoliberal deregulation.

Yemen is a failed state.

The nation state is a crucial factor in the wealth of nations.

And yes their fortunes and empires rise and fall.

The corrupt US regime is an example of decline.

Being interested and involved in the integrity or otherwise of your government is a valid action...but one which if abandoned with cynicism and apathy enables the decline we see in western nations.