Generally speaking it would be "political science" that is the academic discipline that focuses on the study of the roles and functions of government, although in some institutions the major is simply "government".
There are many possible answers for this one! Only the national government can e.g. manage foreign relations, declare war or oversee trade between states and with other countries.
Children get their public opinion from their parents. The parents may be sitting at the dinner table talking about some form of their public opinion. The children are also at the table listening to the parents conversation. By listening to the conversation the children receive a basis from the parents to create their own public opinion.<span />
2. a wise and popular government in the United States is the answer
