The Persian wars were fought against a foreign invader.
The Peloponnesian war was fought among Greeks.
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
<span>b.What he told me before, I am too sad to remember.</span>