1.What is the economic system in the United States?
2.Who is in charge of the executive branch?
3.There were 13 original states. Name three
4.The Federalist Papers supported the passage of the U.S Constitution. Name one of the writers.
5.Name one of the two longest rivers in the United States.
6.When do we celebrate Independence Day?
读：When do we vote for President.
写：We vote for the President in November.