After the war, why did some southerners argue that the war was not about slavery?

In this way, the historiography of the Civil War is somewhat unique. Rarely in human history has a conflict’s losing side been lent such considerable say in how the textbooks remember it. As such, American social studies curricula have long been hobbled by one of the most pervasive myths in US history: that the Civil War was fought to preserve (or undermine) the spectral concept of “states’ rights.”

Explanation:

when a country suffers, for example, a drought period, the market product is affected for a low offer, in this case, potatoes; the government has to tax to the households, which have to give more money for the potatoes which they consume, that situation make them consume substitute goods even through loans, it could increase the financial market movement and the inflationary phenomena, the business has to increase salaries in order to the employees could buy a more expensive food (potatoes) and in order to inflation tha business had to buy expensive supplies in the factor market, while the rest of the world have to gain more money to consume the same amount of potatoes.