The mudsill theory, created by US Southern born James Henry Hammond is indeed correct to a certain extent. The extent to which I refer is that which the theory is correct because indeed there must be, in all societies, a group or social class which does all the dirty work which the upper classes who govern are not disposed to do. This is easily probable by simply looking at the very history of humanity, specifically in places such as Sparta, Communist Russia, the Roman Empire, the European monarchies, and even countries that boast of equality, such as the United States of America, are wrongly doing so because they, too, have a laboring class that must do the dirty work of society. These dirty jobs include a plethora of industries such as office working, farming, and factory laboring, among others. The mudsill theory is also seen in nature and other species of animals, such as ants. Ants have a very specific and well defined hierarchical system in which there is a defined class, a group of worker ants who do the dirty work for everything. In relation to slavery, however, James H. Hammond is wrong because he applies the mudsill theory to the black race only. This is incorrect because time and time again black individuals have shown to have just as much potential as the individuals of any other race, therefore, making the race argument invalid. There does, however, exist a group composed of persons of not one specific ethnicity, religion, sexuality, race, etc., that must always do the dirty work. Therefore, it can be concluded that Hammond was right in his argument to the extent that there must be, in all societies, a mudsill class.
There is no absolute NEED for a group of people to do the dirty work. Why should so called "dirty" work be reserved exclusively for a specific group of people. That is saying that other people have more VALUE than others, and therefore they are above "dirty" work.
And sure you made your ant arguments, but we are not ants. We are a highly evolved and complex species who can think and reason and do not listen to a Queen ant telling us our positions in society.