the following is not a common barrier when people engage in problem solving.
emotional barriers
cultural barriers
learned barriers
language barriers

b.

explanation:

he is racist

"oh, lets coppy china and build a great wall around bla bla bla.that way,we wont lose out to other countries." in the end, he did not build anything

b. great plains

hope this

it was the first amendment

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.