First, I think of a Republic as a system of government where the right to vote exists as a check against the government rather than a voice in government. The ‘rights’ established in the constitution (verb) of the republic are the ‘voice’ of the people. So everyone should be able to vote. A cursory study of the history of civil rights for black Americans shows the importance of this, as well as the impropriety of literacy tests and poll taxes.
Second, in another thread I decided that a government - at some level - must have the power to coercively tax. The reason is that the the rights articulated in the law are meaningless to criminals. Criminals cheat, conspire, assasinate, and so forth. History is repleat with examples of factions that, although it wrecks the economy and society internally, resort to feudal bickering which you can see operating in the modern-day examples of the mafia. The ability to finance power - thugs, muscles, arms, guns - will exceed that of the legally commissioned law enforcement if the wealth of society is sufficiently looted by this criminality. If the police don’t have money, they can’t stop criminal cartels from burning down their rivals’ infrastructure. Then, more of the wealth is concentrated with the criminals, and there aren’t enough non-criminals to donate. Law enforcement therefore needs to be able to procure funding necessary and proper to do their job.
Third, taxation for defense is only proper when protection exists as a public commodity. What I mean (in an example) is that protection in 1700’s S. Carolina from pirates did not affect the immediate safety of Britain. Britain, therefore, theoretically, did not have an obligation to fund the choice of S. Carolinians to live in S. Carolina unless they felt an interest. Protecting trade, keeping the pirates from someday reach England - sure, those are reasons, but reasons up to England to decide upon. So, mandated national defense is sort of altruism depending on the scope, but not altruism also depending on scope. Technically, I, in Maryland, don’t have to worry about Mexican drug cartels in Arizona, or N. Korean missiles in Hawai’i, if I don’t want to. But illegals or terrorists that cross the border in Arizona, and come to Maryland, or Russian missiles that can equally target any spot in America - these issues affect all America. Just as much as I shouldn’t have to pay for the defense of other regions/states, they shouldn’t have to bear all the burden of the cost of defending my region when the threat is nationwide. I think the solution is to use state governments to raise militias, with the power to do so coercively (I mean they may tax). The idea is that if you are walking safely on the street or trading in the market of a town, you are receiving the benefit of those who have defended that homogenous area. Residency itself requires that you pay money. I don’t know what to do about the national army - on the one hand, donations would be appropriate because you can’t argue the ‘country as a whole’ is one unit or identity that is explicitly defended as a whole - not if it’s sufficiently large. Technically, the American Navy and Air Force are one ‘unit’ that effectively deter and depress major conflict worldwide. So, technically, the whole world ‘owes’ America. It’s complicated, but I can see philosophically how taxation or no taxation for national defense would be consistent policies.
The issue has to do with Ayn Rand’s insistence that economic power is not political power. This is a conditional thing: It is political power in fact, because economic power is the power to obtain and concentrate value from the physical world. This idea is about the same as accumlating and concentrating the ability to project power in the physical world. Technically, value usually has to do with building, force with destroying - an important distinction - but both rely on the ability to concentrate energy for one purpose or the other. My point is that economic power is not political power only in a system of power where individual rights are properly protected. Not theorectically or philosophically protected, but actually successfully protected.
The American system is really really good. It’s incomplete and outdated in ways: for one it was envisioned with no real precedent, and assumes many roles of a traditional ‘crown’ and relies a great deal on traditional common law. It is outdated in the sense that there might be better ways than winner-takes-all regional congressional districts. I think Jefferson and later Heinlein imagined a system where within large regions like-minded citizens formed their own representative blocs. But overall it is astonishing.
The republic as a government of laws, and therefore rights, and not people is the only proper way to have government. Federalism is also something I think is necessary. You have states on one end which are sufficiently empowered to protect rights (taxes and so forth), but a federal government on the other which technically is empowered only against the states for the sake of the people, or foreign enemies. The ultimate idea is the limit power as much as possible, so that nowhere in society can a man or men claim any political power for their own will or ideas. Brilliant really. Too bad the idea of this comes from the notion of man’s depravity. Rather, man has no right to initiatory force. So the use of power must be articulately proscribed beforehand in order for man to properly retaliate.