What was the material, introduced by the invaders mentioned earlier, which had had a unique military use it was later valued as a luxury item)?

basic principles: federalism, separation of powers, checks and balances, judicial review, representative democracy, limited government, rule of law, individual rights and responsibilities, consent of the governed, majority rule, popular sovereignty, equal protection.

confederacy: supported slavery, believed states should be able to nullify federal laws, supported low tariffs

union: everything else