Answer:
Madison was primarily concerned about factions due to the uneven distribution of property within society. He asserted, "the most common and durable source of factions has been the various and unequal distribution of property." (Dawson 1863, p. 58)
In Federalist No. 51, Madison elaborated on how the division of authority among the three branches of the federal government, along with the division between state and federal governments, created a system of checks and balances, preventing any single institution from becoming overly dominant.
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The answer is 'the broad application of the Fourteenth Amendment to state policy'.
In 1837, the incorporation of the Bill of Rights into the Fourteenth Amendment had an opportunity but was dismissed by the Court. After the Slaughterhouse Case, the Court essentially impeded any further progress regarding the privileges and immunities clause.