Harold J. Laski 
Reflections on the Revolution of our Time (Works of Harold J. Laski) [PDF ebook] 

This is Laski’s most important book after A Grammar of Politics. It discusses, on a grand scale, every aspect of American public life. Laski surveys American traditions and the American spirit, political institutions, the entire educational, religious, economic and social scene, America as a world power, and Americanism as a principle of civilisation. Laski’s unsurpassed knowledge of American constitutional, social and cultural history is set in the perspective of his deep study of comparative constitutional history and political theory. He was one of very few people to see U.S. politics from the inside, as a result of his friendships with Roosevelt, Brandeis and Oliver Wendell Holmes.