The supremacy clause, which establishes the supreme law of the land, is mentioned in which article of the Constitution?

In a famous speech in Zurich, Harry Truman called for a construction of "a kind of United States of Europe."

Indicate whether this statement is true or false.

How has the Internet helped interest groups in their lobbying efforts?

a. by allowing citizens to easily organize themselves and by opening new forms of political action b. by allowing citizens to register to vote online c. by increasing the security of interest groups' databases d. by making it easier for citizens to submit amicus curiae briefs