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
The Democratic Party asserted dominance in the South after the Compromise of 1877 which effectively ended the Reconstruction and the Republican rule in the South. The promises the Democrats made, to protect and respect the rights of the African American people were not kept and through a series of Jim Crow laws they tried to maintain the control over the black population.
<span>Joseph II of Austria made truly amazing changes based on Enlightenment . Hope this answers your question. : )</span>

Unrestricted submarine warfare is a type of naval warfare in which submarines sink vessels such as freighters and tankers without warning, as opposed to attacks per prize rules (also known as "cruiser rules").
Eratosthenes (276-194 BC) was a Greek mathematician and astronomer who made an amazingly close calculation of the actual circumference of the earth. He did it by noting the angle of shadows in two cities during the summer solstice, and then doing geometric calculations that factored in the distance between the cities.
Oh, and besides math and astronomy, Eratosthenes was also a poet and music theorist, as well as pretty much inventing the field of study we call geography today. He was what we would call a "polymath" (a person of knowledge of all sorts of things) -- or, what the Greeks called a <span>Πένταθλος (pentathlos).</span>