Which issue below played a major role in the democratic party split?

trade tariffs
economic conditions
slavery viewpoints
western expansion

i can't beat you to a pulp if i'm not close enough.

a. because the u.s. was the leading with the most technology, economy, etc. also was teamed with other allies witch boosted the economy and materials to improve technology and use it.

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possession of power

exercising of power

class and power