What caused the american civil war?

For my coursework i need to evaluate factors which could have caused the american civil war and need a conclusion to decide which one was the main factor. Im not sure what factors i should use but i think i should do : westward expansion, slavery and Abraham Lincoln. Would this make a good piece of work or am i... show more For my coursework i need to evaluate factors which could have caused the american civil war and need a conclusion to decide which one was the main factor. Im not sure what factors i should use but i think i should do : westward expansion, slavery and Abraham Lincoln. Would this make a good piece of work or am i missing something?
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