O’Brien meticulously scoured the records available to him at the time, before the age of computers, and provides a great detail of information that may be valuable to genealogical researchers. This is notable since some of this information may have been lost in fires or accidental destruction of the records before they were put on microfiche or digitized.
The records O’Brien presents cover early McCarthys in Virginia, Maryland, the Carolinas, Louisiana, Illinois, Pennsylvania, Delaware, New York, New Jersey, Massachusetts, Connecticut, Rhode Island, Maine, New Hampshire and Vermont.
O’Brien also gives a brief review of where the McCarthys came from and why many of them came to America. Notably due to being exiled in an attempt by the British to break the power of the McCarthys in Ireland.
Unlike other genealogical record books however, O’Brien uses these records to tell the story of the immense contribution, that the Irish in general, and that the McCarthy’s in specific, made to the formation and expansion of the United States. A subtle thread can be realized after reading the book; Though the McCarthys were driven out of the land they helped to rule for a millennia, even with no one leader, the McCarthys were able to leverage their divine gifts of war to help defeat the British in the Americas and thus to help give birth to the Greatest nation to ever exist.
Originally Published in 1921 it has been republished by Nabu Public Domain Reprints.