Homogenous societies are defined as those societies in which the people making up such are united together amongst the lines of their common traits such as skin color, or creed, or language, or various other attributes that are typically based on relatively straightforward visual recognition and/or such members having touchstones or symbols that are commonly used by or acknowledged by those members of that homogenous society.
While it is generally true that a homogenous society appears to get along well with one another, that isn't always the case, as there are always going to be those typical human foibles of trouble and disputes that stir up anger, wrath, and jealousy. However, it should be noted, that homogenous societies, even those that are not functioning very well together, are often quite gifted at coming together when they are attacked by some outside force, for then, as the truism states, blood truly is thicker than water.
One might think, giving the advantage that homogenous societies have in often according respect and therefore helpfulness to their fellow members, that heterogeneous societies would be at a massive disadvantage, and not only that, but that heterogeneous societies would always be susceptible to being subdivided into cliques, that would run along such divisive lines as race, creed, income, status, location and so on and so forth. In fact, to a large extent this is true, as far too many people have a tendency to align with others based on visual similarities or other surface traits that are easily discernible.
There are, however, distinct advantages to being part of a heterogeneous society, of which the biggest advantage is that diversity, or new blood, if you will, makes for a society that will often go further, discover more, and be motivated to accomplish and achieve many things, that the complacency of a homogenous society might not be inclined to do. After all, the friction that a heterogeneous society entails, can be the very means, to make change where there needs to be change, and additionally teaches the salient value, that diverse elements that are united together are far harder to break apart, than that which is made of the very same elements.
So then, the true test of a vibrant heterogeneous society is when it is threatened internally or externally, as to whether it will honor that which has brought them together, or whether it will devolve or revert to that which it once was and thereby become rife with sectional differences and discriminations, to its own destruction. The answer to that question, really comes down to how people see themselves in relation to the society that they are an integral part of--in which, the very best heterogeneous societies see themselves not as a certain race, or creed, or define themselves by their country of origin, but rather have enlightened themselves to take into their heart, that they each are created equally, and that each of them are entitled to fair opportunity, equality under the law, as well as to freedom of conscience; and in recognition of those unalienable rights, they will voluntarily stand united against all forces that would take from them, what is their universal human right, in which all of mankind, without exception, is entitled to.