Due to the Mit'a system, the public service system flourished greatly during in Europe during the period c. 1450-c.1750.
The Mit'a system was invented by the Inca government. Once a person turned fifteen, they were obliged to participate in the Mit'a until they turned fifty. All the people worked for the government for a given period, and this labor was free to the government.
Enormous construction of highways, the Emperor and nobles' house, monuments, temples, bridges, and mines were possible due to the Mit'a system. This is because people in the Inca period worked only 65 days a year for their basic necessities. The other extra time they had could thus be used for free service to the government.
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An Oligarchy. An Oligarchy involves the political power being controlled and organized by a small group within a society. This small group may be families that own a large amount of wealth, military power, nobility, education, etc. in comparison to the majority of the population. Often, Oligarchies involve oppression to obtain obedience by the public. There are certain examples in which power has been passed down through families to keep the power from being shared to transferred from family to family in order to ensure political consistency. While the US has been considered a democracy, there are some who consider it an oligarchy, as a very small number of people who control a majority of the wealth have strong political and social influence in the nation. Aristocracy is very similar to Oligarchy, but the difference is that in Aristocracies the power is always passed down to new generations of family members.
B c and D are the best answers