What does a system of checks and balances protect against

Which of the following is one of the innovations that neolithic farmers become more productive? a) plow b) windmill c) tractor d) reaper

Which beliefs and principles in the declaration of independence and the u. s. constitution create a national identity? a.) belief in god, allegiance to popular sovereignty, and states’ rights. b.) free enterprise system, free trade system, and separation of powers. c.) individual freedom, political equality, and unalienable rights. d.) powerful executive branch, judicial review, and bicameral legislature.

Why did lincoln inform the confederacy that he would not e sending troops or weapons as food supplies were sent to fort sumter?