A major difference between the North and the South was a)The South was needed slaves for the cotton fields and the North needed slaves for their factories. b)The North was becoming industrialized, while the South remained agrarian (farm-based). c)The North's climate didn't allow cotton to be produced, so they didn't have slaves.

b)The North was becoming industrialized, while the South remained agrarian (farm-based).

Explanation:

The northern states of the USA had a strong industrialization and were the main responsible for supplying the country with industrial pipelines, in addition to having a concentration of industries, machines and free workers, since industries did not adopt slave labor. However, a country needs agricultural products to maintain itself and this production was the responsibility of the southern states, which had a strong agrarian nature and supplied the country with this type of production. Farming work required a great deal of cheap labor and for that reason, these states, for the most part, used slave labor.

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question - in 1827, john walker, a druggist in a small english town, tipped a splint with sulphur, chlorate of potash, and sulphid of antimony, and rubbed it on sandpaper, and it burst into flame. the druggist had discovered the first friction-chemical match, the kind we use to-day. it is called friction-chemical because it is made by mixing certain chemicals together and rubbing them. although walker's match did not require the bottle of acid, nevertheless it was not a good one. it could be lighted only by hard rubbing, and it sputtered and threw fire in all directions. in a few years, however, phosphorus was substituted on the tip for antimony, and the change worked wonders. the match could now be lighted with very little rubbing, and it was no longer necessary to have sandpaper upon which to rub it. it would ignite when rubbed on any dry surface, and there was no longer any sputtering. this was the phosphorus match, the match with which we are so familiar. according the paragraph what was the benefit of the new phosphorus match? it burst into flame when rubbed on sandpaper. it was made by mixing chemicals. it could be ignited on any dry surface. it threw fire in all directions.

answer - matches required natural chemicals