A research study considers forces for social change in the United States from both a historical and contemporary standpoint. Beginning with a historical account of American radicalism from before the Revolutionary War through the 1950's to its re-emergence since 1954, particular emphasis is given to different facets of the student movement and "counter culture." A theoretical framework is set forth which considers indicators of structural and cultural transformation. Synchronization between values, institutions, and environment is seen as vital to national stability. Future change is discussed, and it is concluded that a successful response to future problems will require changes in central elements in the cultural value system and a transformation of the structure and purpose of many American institutions. (RB)