<span>The various civil wars of the Roman era were all caused by a power grab by some general or some politician with a strong military backing.</span>
B.) Retaliation by foreign governments.
Southerners feared that tariffs would affect their fortunes given their reliance on exporting their agricultural produce. Retaliation by foreign governments would have meant that they would lose out as imposition of tariffs would reduce demand for their produce
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The Federalists, like most, were worried about one branch (specifically the Executive branch) being too power and too much like a King.
So, they designed a system to ensure that no one branch would become too powerful.