7. Name several mountain groups which help form the Appalachian Mountains.

New York's Catskill Mountains are in central Appalachia, as are the beginnings of the Blue Ridge range in southern Pennsylvania and the Allegheny Mountains, which rise in southwestern New York and cover parts of western Pennsylvania, western Maryland, and eastern Ohio before merging into the third, or southern, region.

Explanation:

answer; taking up arms to defend the nation;

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.