In 1971, Californian congressman Thomas M. Rees told the US House of Representatives that 'very little has been written of what the Welsh have contributed in all walks of life in the shaping of American history'. This book is the first systematic attempt to both recount and evaluate the considerable yet undervalued contribution made by Welsh immigrants and their immediate descendants to the development of the United States. Their lives and achievements are set within a narrative outline of American history that emphasises the Welsh influence upon the colonists' rejection of British rule, and upon the establishment, expansion and industrialisation of the new American nation. This book covers both the famous and the unsung who worked and fought to acquire greater prosperity and freedom for themselves and for their nation.