What was the main reason many Southern states
chose to seceed from the Union?

Slavery

Explanation:

The direct cause was Abraham Lincoln, a Republican president being elected, which caused South Carolina to secede and the rest of the southern states followed. The long term reasons were of course the issue of slavery. The southern states wanted to transport their slaves anywhere in the country, and felt that their interests would be threatened if Abe Lincoln was elected.

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i do not believe this was true indefiantly the native americans would have lsot aganist america one they didndt have the resources and allies that america had and 2   indians werent as advanced at the time as they were not 3 americans had the expreince because some of the soliders from other wars fought in that war and were attecked etc