Shakespeare never intended the play to be historically accurate. In fact, he clearly expected the actors to appear in Elizabethan dress. Furthermore, he gives Rome the medieval invention of the mechanical clock, a notorious anachronism. However, Shakespeare's Romans share a distinct cultural heritage and society, including Roman society's implicit ideals and assumptions. When Antony calls Brutus, "the noblest of the Romans," he is referring to the specific "Roman" virtue, associated with the Republican government Brutus dies defending. The protagonists in the plot are never able to overcome the pressure of the Roman values, and thus are not completely free to invent themselves, relying instead on the cultural values provided.
A free republic will never keep a standing army to execute its laws. It must depend upon the support of its citizens. But when a government is to receive its support from the aid of the citizens, it must be so constructed as to have the confidence, respect, and affection of the people. Men who, upon the call of the magistrate, offer themselves to execute the laws, are influenced to do it either by affection to the government, or from fear; where a standing army is at hand to punish offenders, every man is actuated by the latter principle, and therefore, when the magistrate calls, will obey: but, where this is not the case, the government must rest for its support upon the confidence and respect which the people have for their government and laws. The body of the people being attached, the government will always be sufficient to support and execute its laws, and to operate upon the fears of any faction which may be opposed to it, not only to prevent an opposition to the execution of the laws themselves, but also to compel the most of them to aid the magistrate; but the people will not be likely to have such confidence in their rulers, in a republic so extensive as the United States, as necessary for these purposes. The confidence which the people have in their rulers, in a free republic, arises from their knowing them, from their being responsible to them for their conduct, and from the power they have of displacing them when they misbehave: but in a republic of the extent of this continent, the people in general would be acquainted with very few of their rulers: the people at large would know little of their proceedings, and it would be extremely difficult to change them. The people in Georgia and New-Hampshire would not know one another’s mind, and therefore could not act in concert to enable them to effect a general change of representatives. The different parts of so extensive a country could not possibly be made acquainted with the conduct of their representatives, nor be informed of the reasons upon which measures were founded. The consequence will be, they will have no confidence in their legislature, suspect them of ambitious views, be jealous of every measure they adopt, and will not support the laws they pass. Hence the government will be nerveless and inefficient, and no way will be left to render it otherwise, but by establishing an armed force to execute the laws at the point of the bayonet — a government of all others the most to be dreaded.