What does it mean to say that, in the USA, election of the president is shaped by the federal structure?

According some political experts, the emergence of a minority-majority in America of political consequence. Why?

What role do interest groups serve in the American political process? Interest groups:

Interest groups create Political Action Committees (PAC), which are registered with the FEC. What is the PAC’s express purpose?

Which is/are descriptive of the practices and attitudes of African-Americans? 

Some Americans vote out of a sense of civic duty. What is civic duty?

What is the relationship between lobbyists and interest groups?

Interest groups want to avoid legal limitations on the amount of money they give to campaigns. Contributions are therefore accounted as being spent on party expenses such as outreach and organizing, not to any specific candidate. What is this type of donation called? 

In American unified government the same party, Democrats or Republicans, may control the presidency and both branches of Congress. That is, Democrats or Republicans may control the White House, as well as the House and Senate. Identify a situation in which this is not the case.

The definition: “Official endorsement of a candidate for office by a political party” refers to which?