What was the primary and overriding cause of the civil war?

There were many different Causes of the Civil War between the Union of the North and the Confederacy of the South. The two major causes of the Civil War were slavery and States Rights. The economy in the south was based on the cash crop plantation system which depended on the institution of slavery whereas the economy in the north was based on manufacturing and industry and was not reliant on slaves. The south were concerned about the dominance of the northern states following the election of Abraham Lincoln and the Republican party and the possible infringement of states rights.

racism and segregation.

interdependence is when all participating groups and individuals depend on each other. if you depend on one anothers goods, you end up trading in order to get the items you're looking for. (for ex: if i have food and you have water, we trade in order to depend on each other to live)