Which social groups were the most powerful politically in each society

Patricians were the most powerful politically in each society. There were three foremost political groups in old Catholicism which are described as follows:

The aristocratic patricians were rich and prosperous landowners, managing civilians, authority directors and very well off businessmen. The plebeians were not very rich they were mediocre citizens but the patricians were wealthy aristocrats. Rome ancient were slaves ranges from 30% to 40%.  

the invasive species was introduced due to commercial purpouses, as there was a demand for fur clothes and hence, a business opportunity connected to this product. actually, it was when the nutrias scaped, causing harm to the us ecosystems when they acquired the status of invasive species. in this case they have caused an environmental problem, but it could have affected also economic interests or even human health.