These are the proceedings of the 2nd Krefeld Historical Symposium of 1987 - a meeting of 34 distinguished historians to compare the constitutional history of Germany and the USA. Interdisciplinary in approach - an encounter between legal historians and those specializing in political and social history - the emphasis is on concrete historical realities of constitutional thought in both countries. Dissimilarities between the countries are highlighted in addition to ascertaining factors common to both, to explain why their respective developments diverged. There are 12 papers included, two from each of the six sessions, published here in the original German.