In the 1800's the north and south disagreed about?

They disagreed because North supported high tariffs.The region had most of the banking and other business as well. Tariffs caused imported goods to be more expensive than American manufacturers sell their products.The South opposed rising tariffs because tariffs made imported goods more expensive.And they didn't like it so they sold most of their cotton overseas,gained credit from those foreign buyers.Yet because of the tariff,those goods cost more.

The American Civil War was not a simple struggle between slaveholders and abolitionists, argues Tim Stanley. ... In October 1861 Marx, who was living in Primrose Hill, summed up the view of the British press: ‘The war between the North and South is a tariff war. ... Prior to fighting ... IT MIGHT NOTT BE RIGHT I DONT KNOWW

3. i would say one, but one is not prime nor composite.