Basic introduction to politics in United States
Like it or otherwise, the United States' domestic politics and foreign policy as well as its conduct of international relations still influence or impact on the rest of the world. So, studying and understanding politics in that country is important and the best general introduction, from my own experience, is Thomas R. Dye' s Politics in America which is quite free from partisanship.
Politics in America outlines how the United States' Constitution, Congress (Senate + House of representatives), President, courts, bureaucracy, mass media, political parties and interest groups interact in a political system that makes decisions on many spheres of human activities, both within and beyond the country's boundary. As the 2008 Presidential Election in the United States is heating up, Thomas R. Dye's Politics in America should become an even more valuable reference book for new students of American Studies.