Feudalism. Feudalism was the medieval model of government predating the birth of the modern nation-state. Feudal society is a military hierarchy in which a ruler or lord offers mounted fighters a fief (medieval beneficium), a unit of land to control in exchange for a military service.
Because the third estate wanted to to reduce the power of the clergy, but the church was one of the most important things to society. Hence the church having it's own country (the papal states)
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Explanation:
They found corruption in the Church. The change of the Catholic Church due to the Protestant Church.