Which primary source document could help a historian understand why the US Civil War started

An editorial from the Charleston Mercury I'm 1860 can help us to understand the chief reasons behind the outbreak of the US civil war.   A Charleston Mercury editorial termed the US civil war as the Southern war of Independence.  This is a primary source which was written during the time of US civil war.

the answer is b for brother

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.