Being a citizen in a country means in practice you have that nationality.
Legally and technically, there are exceptions and citizenship/nationality are not fully the same, but the words can be used interchangeably for our purposes here.
For example, if you are a citizen of America, you are an American, meaning you have that nationality.
Citizenship usually endows a lot of rights.
You have the right to reside in a country and go back there however much you want (unless the government imposes restrictions due to a pandemic, of course).
You can use all public facilities, avail health care (if applicable in your country), vote, join their army, run for public office, and so on.
A rule of thumb of having international Bases is that you should not live where you have a passport, because being a citizen ánd a resident of a country often comes with plenty of obligations.
If you are a citizen and live in that country, you are a subject of that country, a minion, a peon.
This means that they can, for example, stop you from leaving that country.
This is what happened to Australians during the COVID-19 pandemic.
The government can also force you to vote (or pay a fine), enforce heavy taxes, limit your source of income, in some cases even draft you into their army, and so on.
You should set up your Citizenship Base in at least 2 countries – but you should ideally not live in those countries.
Having a second and third passport ensures that you will always have somewhere to go even if your primary citizenship or residence runs into trouble.
Ideally, you should be a citizen of tax free countries, so you do not have to pay taxes on your income that you make while you do not live there.
Fortunately, this is rarely the case, and out of all the Western countries, only Americans are in a very bad position concerning this issue.
The United States, land of the “free”, is one of the very few countries in the world where citizens have to keep paying taxes even if they do not live there anymore.
Once you have citizenship in a few other countries, you should seriously consider renouncing your American citizenship. Those taxes can really add up.
You can read more about it The Ridiculous US tax system.
Having citizenship in one nation often means you have free (or at least easier) access to other countries where it has an agreement with.
For example, if you get a Paraguayan passport, you can easily go to other countries in the MERCOSUR group, such as Uruguay, Argentina and Brazil.
I also think freedom of movements play a key role in your passport strategy. Personally I think the best combination is a Caricom passport and a Mercosur passport. That opens up 20+ countries!
Good point Nick, didn’t know about the Caricom passport, but a Mercosur one is 100% on my list to get.