What does Alexander Stephens believe to be the main cause of the division of the Union?

Explanation:

In what became known as the “Cornerstone Speech,” Stephens argued that the new Confederate government was based upon “the great truth that the negro is not equal to the white man.

this forms a narrow, steep sided inlet (sometimes deeper than 1300 metres) connected to the sea. the terminal moraine pushed down the valley by the glacier is left underwater at the fjord’s entrance, causing the water at the neck of the fjord to be shallower than the main body of the fjord behind it.

the answer is a new goverment.